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a body projected up reaches a point A in its path at the end of 4 th second and reaches the ground after 5 seconds from start . the height of A above the ground is? 1]19.6m 2]30.6m 3]11m 4]20m

a body projected up reaches a point A in its path at the end of 4th second and reaches the ground after 5 seconds from start . the height of A above the ground is?
1]19.6m
2]30.6m
3]11m
4]20m

Grade:8

1 Answers

Satyam Kumar
60 Points
3 years ago
Time of flight = 2u/g
Substituting values of t and g we get u=24.5m/s
using s=ut+0.5at2,
s=24.5(4) + 0.5(-9.8)(4)2
s=19.6 m

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