A body droppedfrom rest at a height of 80m How long does it take to reach the ground?(g=10ms², ignore air resistance)
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Answer:
4 sec
Explanation:
height = 80m
g = 10
u = 0
acceleration due to gravity = 10 m/s²
formula = v² = u² + 2as
v² = 0+2×80×10
v² = 0 + 1600
v² = 1600
v = 40
formula = v = u + at
40 = 0 + 10t
40 = 10t
= t
4 = t
4 sec
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