The quantity of motion contained in a body is 50 kg m/s. If the body moves with a speed of 5 m/s, what is the mass of the body?

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Solution

Step 1: Given data
Quantity of motion or momentum = 50 kg m/s
Speed = 5 m/s
Step 2: Momentum
The product of the mass of a body and its velocity is considered momentum.
$M o m e n t u m = m a s s \times v e l o c i t y$
Step 3: Finding the mass of the body
$M o m e n t u m = m a s s \times v e l o c i t y 50 k g m s^{- 1} = m \times 5 m s^{- 1} m = \frac{50}{5} m = 10 k g$
Hence, the mass of the body is $10 k g .$

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