Answer:
- 1.67 m/s
Explanation:
mass of first ball, m = 10 kg
mass of second ball, M = 20 kg
initial velocity of first ball, u = 5 m/s
initial velocity of second ball, U = - 5 m/s (direction is opposite to the first ball)
Let the final velocity of the combined mass is V.
Use the principle of conservation of linear momentum
Momentum before collision = Momentum after collision
m u + M U = ( m + M) V
10 x 5 + 20 x (-5) = (10 + 20) x V
50 - 100 = 30 V
- 50 = 30 V
V = - 1.67 m/s
Thus, the combined mass moves in the negative x axis direction with the velocity of 1.67 m/s.
45) B) Vaporizing water at its boiling point
46) D) There is no change in temperature
47) B) Molecules must be pulled apart
48) D) Steam at 100 C
Hope this helps!
To find the average (aka mean) of a group of numbers, all we need to do is add them up then divide that number by how many numbers we started with
23 + 21 + 24 + 22 = 90
90 ÷ 4 = 22.5
Therefore, the average distance the book traveled on ice is 22.5 cm
15 + 18 + 16 + 17 = 66
66 ÷ 4 = 16.5
Therefore, the average distance the book traveled on concrete is 16.5 cm
In conclusion, the average distance the book traveled on ice is greater than the average distance the book traveled on concrete
Hope this helps you
-AaronWiseIsBae
According to Hooke's Law formula. The force is proportional to the displacement of the spring. I believe
Answer:
t = 3.35 s
Explanation:
It is given that,
Mass of a pumpkin, m = 8 kg
It is dropped from a height of 55 m
We need to find the time taken by it to hit the ground.
Initial velocity of the pumpkin, u = 0
Using second equation of motion to find it as follows :
So, it will take 3.35 seconds to hit the ground.
