Question

When a force is applied on a body of mass 7kg for 3 sec then the velocity of a body is increased by 3m/s.then the force applied on the body is?

Answer 1

Answer: 7N

Explanation:

Force is mass times acceleration, and acceleration is (final velocity-initial velocity)/time.

So,

Let the initial velocity and final velocity of the body be u and v respectively.

Given,

v = u + 3

Force = mass * acceleration

F = m * (v - u) / t

F = 7 * (u + 3 - u) / 3

F = 7 * 3 / 3 = 7 * 1

F = 7 N