Question

A projectile is thrown upward with a velocity v₀ at an angle $α$ to the horizontal. The change in velocity of the projectile when it strikes the same horizontal plane is

Moderate

Solution

$Δ v = a Δ t$ (As, a = constant)
$= (- g \hat{j}) (\frac{2 v_{0} \sin α}{g}) = (- 2 v_{0} \sin α) \hat{j}$
i.e. Change in velocity is 2v₀ sin $α$ , vertically downwards.

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