Physics

Problem

A stone is projected vertically upward and crosses the edge of a balcony with a speed of

5\,\text{m s}^{-1}

. After reaching its highest point it returns and crosses the same balcony again. Neglecting air resistance, the magnitude of its speed during the downward crossing will be a)

5\sqrt{2}\,\text{m s}^{-1}

b) greater than

5\,\text{m s}^{-1}

c) exactly

5\,\text{m s}^{-1}

d) less than

5\,\text{m s}^{-1}

but non-zero

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