Question

a body of mass 2 kg is moving on horizontal surface with initial velocity of 4m/sec comes to rest in 2 sec . if one wants to keep this body moving on the same surface with a velocity of 4 m/sec the force required us?

Answer 1

Heya.......!!!

Given in the Question :

= Initial velocity ( u ) = 4 m/s
= Final velocity ( v ) = 0 { because the body is Uniform velocity }
= time ( t ) = 2 sec

by using general concept

=>> Force is equal to Change in Momentum .

F = m ( v - u ) ÷ t

F = 2 × ( - 4 ) ÷ 2

F = -4 N .



Hope It Helps You ^_^