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Question

A ball is thrown vertically upwards which attains a maximum height of 20 m. Calculate the velocity with which the ball is thrown upwards? (Take g=9.8 m s2)

A
29.79 m s1
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B
17.79 m s1
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C
19.79 m s1
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D
15.79 m s1
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Solution

The correct option is C 19.79 m s1
Let initial velocity of ball be u
Distance travelled, s=20 m
Final velocity, v=0 m s1
Acceleration due to gravity, g=9.8 ms2
Acceleration of the ball, a=9.8 ms2
( motion is in upwards direction)
Using third equation of motion,
v2 = u2 + 2as
0=u2+2×(9.8)×20
u2=392
u=19.79 m s1
Hence, the ball is thrown with velocity 19.79 m s1

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