)A body thrown upwards takes 4 sec to reach max height of a building of 20
storeys. Find height of each storey.
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Answer:
given : t = 4 sec, g = -10m/sec², v = 0
to find height of the building
formula used v = u + gt and s = ut + 1/2 gt²
0 = u + (-10)4
0 = u - 40
u = 40 m/sec
s = 40*4 + 1/2*(-10)4²
s= 160 - 80
s = 80 m
total height of the building is 80 m
height of each storey = 80/20 = 4 m
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