2025 · Q23
A motorcycle has initial velocity of 5 m/s. After 3 seconds, the velocity is 7 m/s. The displacement of the motorcycle in 3 seconds is:
General KnowledgePhysics
- A21 m
- B18 m
- C36 m
- D6 m
Explanation
The acceleration is a = (7 - 5)/3 = 2/3 m/s^2. Using s = ut + (1/2)at^2 with u = 5 m/s and t = 3 s gives s = 5x3 + (1/2)x(2/3)x9 = 15 + 3 = 18 m. The body therefore travels 18 metres in the 3 seconds.