Question

How much work must be done on a 5-kg sled to increase its speed from 10
m/s to 15 m/s?

A. 25

B. 312.5 J


C. 562.5 J
D. 5

Answer 1

Answer:

B. 312.5 J

Explanation:

Work = change in energy

W = ½ mv₂² − ½ mv₁²

W = ½ m (v₂² − v₁²)

W = ½ (5 kg) ((15 m/s)² − (10 m/s)²)

W = 312.5 J