Question

A ball travels 15 metre in 5 second and another 15 metres distance in 2 second .what is the average speed of the ball?​

Answer 1

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As the distance is same,

Average speed= $\huge \frac{2v_1v_2}{v_1+v_2}$

$v_1 = \frac{15}{5} =3m/s\\ \\ v_2=\frac{15}{2} = 7.5m/s$

$\huge\frac{2\times3\times7.5}{3+7.5} \\ \\ =\huge\frac{45}{10.5}= 4.28m/s$

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