If a body is projected vertically upwards from the top of the tower with a velocity of 14.7 m /sec reaches the foot of the tower in 1 sec, then its
time of free fall is:
1) 1 sec
2) 2 sec
3) 2sqrt2 sec
4) None of these
Answers
Given : If a body is projected vertically upwards from the top of the tower with a velocity of 14.7 m /sec reaches the foot of the tower in 1 sec
To Find : time of free fall
Solution:
V = u + at
Velocity at top v = 0 ( free Wall Starta from here)
u = initial velocity = 14.7 m/s
a = g = 9.8 m/s²
as body is thrown upward a will be - ve
=> 0 = 1.47 + (-9.8)t
=> t = 14.7/9.8
=> t = 1.5
1.5 Secs is already taken to reach at top
Hence its not possible that body reaches foot of tower in 1 Sec
Hence there is mistake in data
time of Free fall = Time taken to reach foot of tower - time taken to reach at top
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