A stone is released from the top of a building of height 20 m. calculate : (a) the total time to return to the surface of the earth. (b) its final velocity just before touching the ground.
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Class 11
>>Physics
>>Motion in a Straight Line
>>Problems on Equation of Motion
>>A stone is dropped from a height of 20 m
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A stone is dropped from a height of 20 m. Calculate the velocity with which it hits the ground and the time taken. (g=10m/s
2
)
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Correct option is B)
Distance (s) =20 m
Initial velocity =0 m/s
g=10 m/s
2
By using the formula:
v
2
=u
2
+2as
v
2
=0
2
+2×10×20
v
2
=400
v
2
=
400
v=20m/s
For calculating time:
V=u+at
20=0+10×t
t=
10
20
t=2 sec
The the stone will hit the ground with a velocity of 20 m/s in sec.
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