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**1. Homework Statement**

A block of mass 2 kg starts from rest and begins to move at time t=0 along a straight line on a smooth horizontal surface. The displacement of the block, s, depends on time, t, given by s=3+2t+t^3 . t is expressed in second and s in meter. Calculate the average force acting on the block during the first 3 seconds of its motion. Express your answer in Newton.

**2. Homework Equations**

F=ma

**3. The Attempt at a Solution**

To find avg force , I'll need to find avg acceleration and then multiply it with mass of block.

But the problem is I don't know how to calculate avg acceleration from displacement as a function of time . Please Help.

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