Question

How much work must be done to stop a 1215 kg car moving at 100 km/h in a straight path?

Answer 1

Work done = 466.128 KJ

Step-by-step explanation:

We can solve this question using the work-energy theorem

Given,

Velocity = 100km/hr = 27.7 m/s (Approx)

Mass = 1215 kg

Initial velocity = 0

Work done = 1/2 m
`(v-u)^(2)`

= 1/2*1215 * 27.7*27.7

= 466.128 KJ

For neat explanation you can refer to the attachment