Answer:
The force needed to slow down the car is, F = 67.5 N
Explanation:
Given data,
The mass of the car, m = 15 kg
The initial velocity of the car, V = 60 m/s
The final velocity of the car, v = 15 m/s
The time period of deceleration, t = 10 s
The difference in the momentum of the car is,
mV - mv = 15(60 - 15)
= 675 kg m/s
The rate of change in momentum of the car gives the force acting on it.
F = (mV - mu) / t
Substituting the values,
F = 675 / 10
= 67.5 N
Hence, the force needed to slow down the car is, F = 67.5 N
We know that,
Mass of skier is <u>25</u> kg
0.6 is the answer
Hope this helped
The answer is c
Distance/speed=time
Therefore 4000/500=8
11. B
12. A
13. D
14. The ball burnt off energy while rolling, it lost potential energy and couldn't go as high.
