A ball is thrown vertically upwards from the top of a tower with an initial velocity of 30m/s. If the
height of the tower is 135m, calculate the time it would take the ball to reach the ground from
the time it is thrown. (g = 10m/s2
)
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Answer:
the time is 9 seconds
Explanation:
using the formula
-S=ut-1/2gt^2
-135=30t-1/2×10t^2
-135=30t-5t^2
solve t
t=-3 or 9
time should not be negative so
9is the answer
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