How long will it take a force of 10 N to stop a mass of 2.5 kg which is moving at 20 m/s?

For how long should a force of 100 N act on a body of mass 20kg so that it aquires a velocity of 100m//s ?

A constant retarding force of 20 N acts on a body of mass 5 kg moving initially with a speed of 10 ms^(-1) . How long does the body take to stop?

How long will it take to stop a car travelling at a speed of 20 m//sec , if the uniform acc. during braking is -5 m//s^(2) ?

The acceleration produced by a force of 5 N acting on a mass of 20 kg in m/ s^(2) is :

The masses of 10 kg and 20 kg respectively are connected by a massless spring as shown in figure. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has acceleration 12" m"//"s"^(2) . What is the acceleration of 20 kg mass?