Physics

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

4\,\text{s}

. b. (b) Find its speed at the end of

4\,\text{s}

. c. (c) Determine the acceleration during the next

3\,\text{s}

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

7\,\text{s}