1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andrew11 [14]
4 years ago
12

A child of mass 25 kg is skating fast, +10 m/s, and tries to get revenge by colliding with the 60 kg adult who is sitting still.

After the collision, the adult goes forward at 6 m/s. What is the child's final velocity?
Physics
1 answer:
tankabanditka [31]4 years ago
4 0

Answer: -4.4 m/s

Explanation:

This problem can be solved by the Conservation of Momentum principle, which establishes that the initial momentum p_{o} must be equal to the final momentum p_{f}:

p_{o}=p_{f} (1)

Where:

p_{o}=m_{1}V_{o}+m_{2}U_{o} (2)

p_{f}=m_{1}V_{f}+m_{2}U_{f} (3)

m_{1}=25 kg is the mass of the child

V_{o}=10 m/s is the initial velocity of the child

m_{2}=60 kg is the mass of the adult

U_{o}=0 m/s is the initial velocity of the adult (it is sitting still)

V_{f} is the final velocity of the child

U_{f}=6 m/s is the final velocity of the adult

Substituting (2) and (3) in (1):

m_{1}V_{o}+m_{2}U_{o}=m_{1}V_{f}+m_{2}U_{f} (4)

Isolating V_{f}:

V_{f}=\frac{m_{1}V_{o}-m_{2}U_{f}}{m_{1}} (5)

V_{f}=\frac{(25 kg)(10 m/s)-(60 kg)(6 m/s)}{25 kg} (6)

Finally:

V_{f}=-4.4 m/s This means the velocity of the child is in the opposite direction

You might be interested in
Which magnet will produce the strongest force of attraction when placed beneath this magnet?
Kruka [31]

Answer:

B

Explanation:

3 0
4 years ago
Read 2 more answers
What gas law looks at the relationship between pressure and temperature of a gas? A) Boyle's Law B) Charles' Law C) Gay Lussac's
Mandarinka [93]

Answer: it should be Boyle’s law

Explanation:

6 0
3 years ago
Read 2 more answers
A diverging lens of focal length 18.0m is used to view a shark that is 90.0m away from the lens. If the image formed is 1.0m lon
Reil [10]

Answer:

i. + 22.5 m ii. 4.0 m

Explanation:

i. Image distance

Using the lens formula

1/u + 1/v = 1/f where f = focal length = + 18.0 m, u = object distance = distance of shark away from lens = + 90.0 m and v = image distance from lens = unknown

So, we find v

1/v = 1/f - 1/u

= 1/+18 - 1/+90

= (5 - 1)/90

= 4/90

v = 90/4

= + 22.5 m

So the image is real and formed 22.5 m away on the other side of the lens.

ii Length of Shark

Using the magnification formula, m = image height/object height = image distance/object distance. image height = 1.0 m where object height = length of shark.

m = image distance/object distance

= v/u

= +22.5/+90

= 0.25

0.25 = image height/object height

So,

object height = image height/0.25

= 1.0 m/0.25

= 4.0 m

So, the length of the shark is 4.0 m

7 0
3 years ago
very dense * powerful gravitational field * extremely compact space object * spectroscope data reveal swirling gas Observations
pickupchik [31]
All of the observations except "powerful gravitational field" are consistent with the current theory of black holes.

The gavitational field of a black hole is thought to be no different than that of an ordinary star with the same mass.
5 0
3 years ago
How much water is displaced by a solid object with a volume of 9 cm3 that is completely submerged in the water?
Sati [7]

Given :

An object with a volume of 9 cm³ is completely submerged in the water.

To Find :

How much water is displaced by the object.

Solution :

According to Archimedes' principle, the amount of volume displaced of fluid when an object is fully and partially submerged into that is equal to the volume of the object below the surface of liquid.

Now, it is given that object is fully submerged into water.

Therefore, volume of water displaced by the object is 9 cm³.

6 0
3 years ago
Other questions:
  • What will be the force if the particle's charge is tripled and the electric field strength is halved? Give your answer in terms
    6·1 answer
  • According to the law of conservation of mass, in all chemical reactions _____. changing the bonds changes the mass total mass is
    10·2 answers
  • A cat climbs 10 m directly up a tree.
    11·1 answer
  • What type of weather would be in the middle of the picture, where the barometric pressure is 1000 millibars?
    13·1 answer
  • 5750 milliliters converted to Liters
    9·2 answers
  • Imagine that you were given a ship equipped with a device that could measure how deep the water is. You are asked to use this sh
    14·1 answer
  • The gas in a cylinder has a volume of 3 liters at a pressure of 117 kpa. the pressure of the gas is increased to 219 kpa. assumi
    6·1 answer
  • HOW DO WE HELP OTHERS NOT BE SAD IF THEY DON'T LIKE HUGS?
    9·2 answers
  • What is the importance of antacid in human health​
    10·2 answers
  • a spring with a constant of 80N/m is stretched by a force of 240N. how much the displacement of the spring from equilibrium?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!