WAEC - Physics (2004 - No. 18)
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]
1.5s
3.0s
5.0s
7.5s
解释
t = 2\(\frac{(v - u)}{g} = 2\frac{(0 - 15)}{-10}\)
\(\frac{2 \times 15}{10}\) = 3.0s
\(\frac{2 \times 15}{10}\) = 3.0s