A 2 kg body initially has velocity v = (3, 4, 0) m/s. It enters a region with a constant force of 6 N along +z and remains there for 5/3 s. Its velocity on leaving the region is:
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Question

A 2 kg body initially has velocity v = (3, 4, 0) m/s. It enters a region with a constant force of 6 N along +z and remains there for 5/3 s. Its velocity on leaving the region is:

G1 Physics · Accepted Answer

Acceleration is a = F/m. Since F = 6 N along +z and m = 2 kg: a = (0, 0, 3) m/s². Initial velocity: u = (3, 4, 0) m/s. Time: t = 5/3 s. Using v = u + at: v = (3,4,0) + (0,0,3)(5/3) = (3,4,5) m/s. Correct option: B.