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A body of mass 5 kg statrs from the orig...

A body of mass 5 kg statrs from the origin with an initial velocity `vec(u) = (30 hat(i) + 40 hat(j)) ms^(-1)`. If a constant force `(-6 hat(i) - 5 hat(j))N` acts on the body, the time in which they component of the velocity becomes zero is

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The correct Answer is:
40
`u_(y) = 40 m//s, F_(y) = - 5N, m = 5kg`.
So `a_(y) = (F_(y))/(m) = - 1 m//s^(2)` (as v = u + at) `:. V_(y) = 40 - 1 xx t = 0 implies t = 40` sec
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