Physics

Problem

A toy car of mass

0.5\,\text{kg}

moves at

6\,\text{m/s}

. After extra blocks are attached, its mass becomes

0.8\,\text{kg}

and its speed reduces to

3\,\text{m/s}

. By what percentage does its momentum change? a) decreases by

25\%

b) increases by

20\%

c) decreases by

20\%

d) decreases by

50\%