A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms^-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms^-1]

40%

35%

20%

15%

Correct answer is C

P.E = mgh = 1000m joules

K.E = \(\frac{1}{2}\)mv² = 200m joules

%converted = \(\frac{200m}{1000m}\) x 100

= 20%

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A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms-1]