A. 4 N
B. 25 N
C. 100 N
D. 1500 N
Answer
Correct Answer: A. 4 N
Detail about MCQs
To calculate the magnitude of force required to stop a body with a certain momentum, you can use the formula for force:
Force=Change in MomentumTimeForce=TimeChange in Momentum
In this case, the initial momentum of the body is 100 kg m/s, and you want to stop it in 25 seconds, so the change in momentum is equal to the initial momentum because you want to bring it to rest:
Change in Momentum = Initial Momentum = 100 kg m/s
Time = 25 seconds
Now, plug these values into the formula:
Force=100 kg m/s25 s=4 NForce=25s100kg m/s=4N
So, the magnitude of force required to stop the body in 25 seconds is 4 N. Therefore, the correct answer is A. 4 N.