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
nalin [4]
3 years ago
14

If a small rock is dropped from a height of 3.1 m how fast will it be moving when it reaches the ground 0.80 seconds later

Physics
1 answer:
garik1379 [7]3 years ago
5 0
X=1/2 at^2
3.1=1/2 a *0.64
a=9.68
v=at
v=0.8*9.6875=7.75

You might be interested in
The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration of −5.2
sergejj [24]

Answer:

The car strikes the tree with a final speed of 4.165 m/s

The acceleration need to be of -5.19 m/seg2 to avoid collision by 0.5m

Explanation:

First we need to calculate the initial speed V_{0}

x=V_{0} *t+\frac{1}{2} *a*(t^{2} )\\62.5m=V_{0} *4.15s+\frac{1}{2} *-5.25\frac{m}{s^{2} } *(4.15^{2} )\\V_{0}=25.953\frac{m}{s}

Once we have the initial speed, we can isolate the final speed from following equation:

V_{f} =V_{0} +a*t  V_{f}= 4.165 \frac{m}{s}  

Then we can calculate the aceleration where the car stops 0.5 m before striking the tree.

To do that, we replace 62 m in the first formula, as follows:

x=V_{0} *t+\frac{1}{2} *a*(t^{2} )\\62m=25.953\frac{m}{s}*4.15s+\frac{1}{2} *-a\frac{m}{s^{2} } *(4.15^{2} )\\a=-5.19\frac{m}{s^{2} }

3 0
3 years ago
Read 2 more answers
How does this level of organization relate to cells? To organ systems?
Setler [38]
System is a group of similar organs working together...... Organ is a group of similar tissues forming a layer in an organism which perform a specific function.....tissue is a group of similar cell which carry out a particular function
4 0
4 years ago
E
N76 [4]

Answer:

Weight

Explanation:

Weight is the downward pull on an object due to gravity.

For example, the moon has less gravity than Earth so we would weigh less on the moon. Our Mass and volume always stay the same but our weight could change.

4 0
3 years ago
The people in a location in Florida mainly grow crops which need a lot of water. Which of these statements about the location be
Arisa [49]
The people of Florida are closest to the equator and also near 2 different bodies of water and have rivers running thru them as well salt water and fresh water. they need alot of freshwater due to monsoon seasons, hurricanes etc, its humid and hot there so naturally you need to water more often and frequently.
4 0
3 years ago
Read 2 more answers
A space shuttle takes off from FL and circles Earth several times, finally landing in CA. While the shuttle is in flight, a phot
mixer [17]

Answer:

Both the astronauts and photographer have the same displacement

Explanation:

Displacement is the minimum distance between two point. The initial point of both the astronauts and the photographer was Florida and the final point was California. So, the minimum distance for both of the astronauts and the photographer would be the distance between Florida and California would be the same.

Hence, both the astronauts and photographer will have the same displacement.

3 0
4 years ago
Other questions:
  • Power can be defined as the distance over which work was done. how much work can be done in a given time. all the work in a give
    9·1 answer
  • 2. Jessie studies seaweed and she usually takes large amounts of samples. She would take
    7·1 answer
  • Identify the techniques used to try to locate extra solar (exo) planets
    15·2 answers
  • For refraction to occur in a wave, the wave must
    9·2 answers
  • Can yall do this for me??​
    11·1 answer
  • You can report sexual harassment to:
    13·1 answer
  • Why does a heater having low resistance heating coils get heated more?​
    10·2 answers
  • how can changing the kinetic energy of an object cause energy to be transferred to or from the object
    9·1 answer
  • You matter .<br>Until you Multiply yerself by the speed of Light Squared. <br>Then you Energy.<br>​
    5·2 answers
  • Question 5 (1 point)
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!