A body falls freely from a height 105 m. After 1 s of fall gravity disappears. Total time taken by it to reach the ground will be (g = 10 m/s2)
Answers
Given : A body falls freely from a height 105 m.
After 1 s of fall gravity disappears.
(g = 10 m/s²)
To Find : Total time taken by it to reach the ground
Solution:
Gravity is for 1 sec
u = 0
v = u + at
a = g = 10 m/s²
Velocity after 1 sec
v = 0 + 10(1) = 10 m/s
Distance covered in 1 Sec
S = ut + (1/2)at²
S = 0 + (1/2)(10)1²
=> S = 5
Remaining Distance = 105 - 5 = 100 m
as no more gravity so velocity is constant = 10 m/s²
Time Further taken = 100/10 = 10 sec
Total Time Taken = 1 + 10 = 11 secs
Time taken by body to reach ground is 11 secs
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