The average resisting force that must act on `5kg` mass to reduce its speed from 65 to `15ms^-1` in `2s` is

The average resisting force that must act on a 5 kg mass to reduce its speed from 65cms^(-1) to 15cms^(-1) in 0.2 s is

A constant force acting on a body of mass of 5 kg change its speed from 5ms^(-1) "to" 10ms^(-1) in 10 s without changing the direction of motion. The force acting on the body is

A constant force acting on a body of mass of 5 kg change its speed from 5ms^(-1) "to" 10ms^(-1) in 10 s without changing the direction of motion. The force acting on the body is

A constant force acting on a body of mass 3 kg changes its speed from 2ms^(-1) to 3.5 ms^(-1) in 25 s. The direction of motion of the body remains unchanged. Calculate magnitude and direction of the force.