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A body has an eastward velocity of 40 m/s at t=0 at point O and a westward acceleration of 10m/s 2. The speed of the body is 40 m/s again after t= ? (A) 4s (B) 6s (C) 8s (D) not possible

A body has an eastward velocity of 40 m/s at t=0 at point O and a westward acceleration of 10m/s2.
The speed of the body is 40 m/s again after t= ?
(A) 4s
(B) 6s
(C) 8s
(D) not possible

Grade:11

1 Answers

Himanshu Rathour
119 Points
5 years ago
Velocity of body=40m/s in east direction
Acceleration =10m/s² in west.....
Hence if u=(-40)m/s
a=+10m/s²
v=+40m/s
By v=u+at
40=-40+10t
t=8s

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