Question

an object Travels 16 m in 4 seconds and then another 16 m in 2 seconds .what is the average speed

Answer 1

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First, lets find each speed separately

Case (i)

$S_1 = D_1/t_1$

$S_1 = 16/4$

$S_1 = 4 m/s$

Case (ii)

$S_2 = D_2/t_2$

$S_2 = 16/2$

$S_2 = 8m/s$

Now,

Average speed

$= (S_1 + S_2)/2$

$=(4+8)/2$

$= 12/2$

$= 6m/s$