First slide

Work

Question

A body of 5kg has linear momentum $20 k g m s^{- 1}$ its kinetic energy is

Moderate

A

100J
B

40J
C

60J
D

80J

Solution

$\begin{array}{l} KE = \frac{1}{2} m v^{2} = \frac{p^{2}}{2 m} = \frac{20 \times 20}{2 \times 5} \\ KE = 40 J \end{array}$

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