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Two balls, X and Y, weighing 5 g and 50 kg respectively, were thrown up vertically...

Physics
JAMB 2011

Two balls, X and Y, weighing 5 g and 50 kg respectively, were thrown up vertically at the same time with a velocity of 100 ms\(^{-1}\). How will their positions be one second later?

  • A. X and Y will be 500 m from each other
  • B. Y will be 500 m ahead of X
  • C. X will be 500 m ahead of Y
  • D. X and Y both be 500 m from the point of throw
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Correct Answer: Option D
Explanation

V\(^2\) = U\(^2\) - 2gS
0 = 100\(^2\) - 2 x 10 x S = 10000 - 20S
S = \(\frac{10000}{20}\) = 500m
Which is independent of mass. The two bodies were acted upon by the same retarding force of gravity, which is independent of the mass of the body; therefore, both will be 500 m from the point of throw.

There is an explanation video available below.


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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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