Physicshard · Past Paper
A force F = (5i + 3j) N is applied on a body which displaces it by s = (2i - 1j) m. The work done is:
A7 J
B13 J
C10 J
D11 J
✓ Correct Answer: A — 7 J
Work = F dot s = (5*2) + (3*-1) = 10 - 3 = 7 Joules.
Share this question
More from Physics
- An object covers equal distances in equal intervals of time. This is called:
- Which characteristic of sound allows us to distinguish between a note played on a piano and a note of the same pitch and loudness played on a violin?
- A body covers first half of total distance with speed v1 and second half with speed v2. The average speed is:
- An object weighs 10 N in air and 8 N when fully immersed in water. What is the upthrust acting on it?
- If a body moves with constant velocity, its acceleration is: