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Q: If a trolley is moving at an acceleration of 2m/s ² from rest, then after 4 seconds its velocity will be:
  • A. 8 m/s
  • B. 2 m/s
  • C. 8 m/s ²
  • D. 2 m/s ²
Correct Answer: Option A - Given – a = 2 m/s ² t = 4 sec. Initial velocity (u) = 0, Final velocity (v) = ? From first equation of motion, v = u +at v = 0 + 2 x 4 v = 8 m/sec
A. Given – a = 2 m/s ² t = 4 sec. Initial velocity (u) = 0, Final velocity (v) = ? From first equation of motion, v = u +at v = 0 + 2 x 4 v = 8 m/sec

Explanations:

Given – a = 2 m/s ² t = 4 sec. Initial velocity (u) = 0, Final velocity (v) = ? From first equation of motion, v = u +at v = 0 + 2 x 4 v = 8 m/sec