Physicsmedium · Past Paper
A body of mass 5 kg is moving with a velocity of 2 m/s. If its velocity is increased to 4 m/s, the work done is:
A10 J
B20 J
C30 J
D40 J
✓ Correct Answer: C — 30 J
Work = 1/2 m(v2^2 - v1^2) = 1/2 * 5 * (16 - 4) = 1/2 * 5 * 12 = 30 J.
Share this question
More from Physics
- In a vacuum, a feather and a coin are dropped from the same height. Which one hits the ground first?
- What is the weight of an object of mass 50kg in a lift falling freely?
- How many Joules are there in 1 kilowatt-hour (kWh)?
- Which device is used to maintain a constant current by varying resistance?
- If a car travels 100km at 40km/h and the next 100km at 60km/h, the average speed is: