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 :

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

  1. A

    5s

  2. B

    20s

  3. C

    40s

  4. D

    80s

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    Solution:

    m=5kg,u¯=30i+40j

    F¯=i5jVy=0t=?

    vy=uy+ayt=uy+Fymt

    0=40+(5)5tt=40s

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