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Question

A body of mass 5 kg starts from the origin with an initial velocity u=(30^i+40^j)ms1. If a constant force F=(^i+5^j)N acts on the body, the time in which the y-component of the velocity becomes zero is

A
5s
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B
20s
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C
40s
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D
80s
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Solution

The correct option is C 40s
Here, mass of the body , m=5kg; y-component of initial velocity, uy=40m/s and y-component of the force, Fy=5N
Using F=ma, ay=Fym=55=1 m/s2
Using formula, v=u+at
vy=uy+ayt
So, 0=40t
t=40 sec

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