18. Problem on force

 

An object with the mass of 4 \(kg\) moving along a straight line in a long table with initial velocity 28 \(m/s\). The object's velocity gradually decreases to \(0\) \(m/s\) in the time period of \(10\) \(s\).

Calculate:

The acceleration of the object \(=\) \( ms^{-2}\)

The force acting on the object \(=\) \(N\)