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A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from...

Physics
JAMB 1999

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

(take g = 10ms-2)

  • A. 5 J
  • B. 10 J
  • C. 15 J
  • D. 20 J
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Correct Answer: Option C
Explanation

Total Energy  = Kinetic Energy + Potential Energy

P.E = mgh = 0.1 x 10 x 10= 10 J

 K.E = \(\frac{1}{2}\) MV\(^2\) =  \(\frac{1}{2}\) x 0.1 x 10\(^2\) = 0.5 x 0.1 x 100 = 5J

T.E = K.E + P.E = 5 + 10 = 15J


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