First slide

Concept of potential energy

Question

The decrease in the potential energy of a ball of mass 20 kg which falls from a height of 50 cm is

Easy

A

968 J
B

98 J
C

1980 J
D

None of these

Solution

$ΔU = mgh = 20 \times 9 .8 \times 0 .5 = 98 J$

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