Question

A 2-kg toy car accelerates from 5 to 10 m/s.

Answer 1

Full Question:

A 2-kg toy car accelerates from 5 to 10 m/s in 2 seconds. Find the applied force.

Answer:

Force applied is $5\frac {kgm} {s^2}$.

Explanation:

Force is defined as something which changes or tends to change the velocity of a body. And acceleration is defined as the rate of change of velocity of a body per time. Both of them are vector quantities.

The initial velocity of the body = 5 m/s.

The final velocity of the body = 10 m/s.

So the change in velocity = 10 - 5 m/s = 5m/s.

Time period = 2 seconds.

So acceleration =$\frac52 m/s^2$= $2.5 m/s^2$

The force is defined as the product of mass and acceleration of the body.

Mass of body = 2 kg.

So, force applied =  $2 \times 2.5 kgm/s^2$. =$5kgm/s^2$.