Question

. A body with mass 5 kg is acted upon by a force F= (-3i+4j)N , If its initial velocity at t = 0 is u=(6i-12j)ms- , the time at which it will just have a velocity along the Y-axis is :- (1) never (2) 10 s (3) 2 s (4) 15 s

Answer 1

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11th

Physics

Motion in a Straight Line

Problems on Equation of Motion

A body with mass 5 kg is ac...

PHYSICS

A body with mass 5 kg is acted upon by a force F = ( -3 i^ + 4 j^)N. If its initial velocity at t=0 is v = ( 6 i^ - 12 j^)ms−1, the time at which it will just have a velocity along the y-axis is

A

never

B

10 s

C

2 s

D

15 s

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ANSWER

Our interest is in finding the moment when the velocity along X-axis becomes zero. So noting the initial velocity along X-axis as u=6m/s

Acceleration along X-axis is Force along X-axis/mass=−3/5=−0.6m/s2

Time taken in making the velocity along X-axis to zero is change in velocity/acceleration=(−0.6)(0−6)=10second

Explanation:

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