A ball bearing is projected vertically upwards from the ground with a velocity of 15ms-1. Calculate the time taken by the ball to return to the ground [g = 10ms-1]
-
A.
1.5s -
B.
3.0s -
C.
5.0s -
D.
7.5s
Correct Answer: Option B
Explanation
t = 2(frac{(v – u)}{g} = 2frac{(0 – 15)}{-10})
(frac{2 times 15}{10}) = 3.0s