Physics

Physics

Problem

A stone of mass

0.5\,\text{kg}

is projected with an initial speed of

40\,\text{m/s}

at an angle of

60^{\circ}

. Calculate its speed when it is at a height of

20\,\text{m}

above the launch point. (Take

g = 10\,\text{m/s}^{2}

).

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