A toy car of mass is initially at rest on a horizontal table

PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

A toy car of mass

2\,\text{kg}

is initially at rest on a horizontal table. It experiences a constant forward force of

6\,\text{N}

for

4\,\text{s}

. After this, the driving force is removed and only a frictional force of

2\,\text{N}

acts opposite to the direction of motion for the next

3\,\text{s}

. (a) Calculate the acceleration of the car during the first

4\,\text{s}

. (b) Find its speed at the end of

4\,\text{s}

. (c) Determine the acceleration during the next

3\,\text{s}

. (d) State the speed of the car at the end of the total

7\,\text{s}