A ball is thrown vertically upwards with a velocity of $30$ m s$^{-1}$. Find the maximum height reached. (Take $g = 10$ m s$^{-2}$.)

Question

Accepted Answer

$45$ m. At maximum height $v = 0$, so from $v^2 = u^2 - 2gh$: $0 = 900 - 20h$, giving $h = 45$ m. Forgetting the factor 2 in $2gh$ gives 90 m.

Answer

A) $45$ m

Answer

B) $3$ m

Answer

C) $300$ m

Answer

D) $90$ m

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