A body of mass 5 kg starts from the origin with an initial velocity u = 30 i ^ + 40 j ^ m s - 1 . If a constant force - 6 i ^ - 5 j ^ N acts on the body, the time in which the y component of the velocity becomes zero is

Question

A body of mass 5 kg starts from the origin with an initial velocity u = 30 i ^ + 40 j ^ m s - 1 . If a constant force - 6 i ^ - 5 j ^ N acts on the body, the time in which the y component of the velocity becomes zero is, 5 s, 20 s, 40 s, 80 s

MARKS App · Accepted Answer

From Newton's second law of motion, F y = △ P y △ t △ t = △ P y F y = 0 - 5 × 40 - 5 = 40 s

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