Question

How much work is done to increase the speed of a 1.0 kg toy car by 5.0 m/s?

50 J,
12.5 J,
25 J,
49 J​

Answer 1

The correct option is (b).

Step-by-step explanation:

We need to find the work done to increase the speed of a 1 kg toy car by 5 m/s.

We know that, the work done is equal to the kinetic energy of an object i.e.

`W=\Delta K\\\\W=(1)/(2)mv^2\\\\W=(1)/(2)* 1* 5^2\\W=12.5\ J`

So, 12.5 J of work is done to increase the speed of a 1.0 kg toy car by 5.0 m/s.