Verified Answer :

P = mV
7,5 = m15
m = 0,5 kilogram

Explanation:

Momentum means the ability or tendency of an atom to continue moving.

The relation between momentum, mass and speed or velocity is as follows.

                       p = m × v

where,   p = momentum

             m = mass of object

             v = velocity of object

It is given that speed of stone is 15 m/s, and momentum is 7.5 kg m/s. Therefore, calculate the mass of a stone as follows.

                     p = m × v

                 \(m = \frac{p}{v}\)

                        = \(\frac{7.5 kg m/s}{15 m/s}\)

                        = 0.5 kg

Thus, mass of the stone is 0.5 kg.

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