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Question

With what speed must an object be thrown vertically upwards to reach a height of 125 m? (Take g=10 m/s2)

A
20 m/s
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B
30 m/s
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C
50 m/s
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D
40 m/s
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Solution

The correct option is C 50 m/s
  • When an object is thrown upward, its velocity starts to reduce and becomes zero at the highest position.
  • Here, the acceleration due to gravity is uniform and opposite to the direction of velocity.
Therefore,
s=125 m,v=0 m/s,a=10 ms2,u=?
Using the third equation of motion,
v2u2=2as
02u2=2×(10)×125
u=50 m/s

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