Question

If the meter stick falls 0.20m before you catch it, what is your reaction
time? ( g = 10 ms-2)

Answer 1

Explanation:

$h \: = \frac{1}{2}g {t}^{2} \\ t = \sqrt{ \frac{2h}{g} } \\ t = \sqrt{ \frac{2 \times 0.20}{10} } \\ t = \: \sqrt{ \frac{0.4}{10} } \\ t = \: \sqrt{0.04} \\ t = 0.2s$

Hope it helps ??