Question

The engine of a motorcycle did an amount of work W while reaching a speed

of v. If the engine could perform work 4W then the final speed would be?

Answer 1

2v

Step-by-step explanation:

Work = change in energy

W = KE

W = ½ mv²

At 4 times the work:

4W = ½ mu²

4(½ mv²) = ½ mu²

2 mv² = ½ mu²

2 v² = ½ u²

4 v² = u²

u = 2v