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Q.

A body of mass 5kg starts from the origin with an initial velocityu→=30i^+40j^ms−1 . If a constant forceF→=−(i^+5j^)N acts on the body, the time in which the y–component of the velocity becomes zero is :

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a

5s

b

20s

c

40s

d

80s

answer is C.

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Detailed Solution

m=5kg, u¯=30i+40j F¯=−i−5j Vy=0 t=? vy=uy+ayt=uy+Fymt 0=40+(−5)5t t=40s

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A body of mass 5kg starts from the origin with an initial velocityu→=30i^+40j^ms−1 . If a constant forceF→=−(i^+5j^)N acts on the body, the time in which the y–component of the velocity becomes zero is :