A stone is thrown vertically from the tower of height 25m with speed of 20m/s. What time does it take to reach the ground?
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Answer:
4 seconds
Explanation:
s = 25m
u = 20m/s
v = 0m/s ( AS the object is thrown upwards)
g = - 10m/s² (AS the object thrown is against gravity)
by Newtons First law,
v = u+ gt
0 = 20 + (-10)t
0 = 20 -10t
- 10t = 20
t = 20/10
t = 2
total time = 2t
= 2x 2
= 4 s
thus the object would take 4 seconds to reach the ground
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