A body of mass 5kg starts from the origin with an initial velocity . If a constant force N acts on the body, the time in which the y -component of the velocity becomes zero is
  • a)
    5s
  • b)
    20s
  • c)
    40s
  • d)
    80s
Correct answer is option 'C'. Can you explain this answer?

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Answers

Mohit Rajpoot
Jan 18, 2022
Here m = 5kg
∴ uy = 40 m s-1 and Fy = -5 N
 
= 1 m s-1 vy = 0
As vy = uy + ayt or 0 = 40-1 x t
∴  t = 40s

Here m = 5kg∴ uy = 40 m s-1 and Fy = -5 N= 1m s-1vy = 0As vy = uy + ayt or 0 = 40-1 x t∴ t= 40s
Here m = 5kg∴ uy = 40 m s-1 and Fy = -5 N= 1m s-1vy = 0As vy = uy + ayt or 0 = 40-1 x t∴ t= 40s