First slide

Projection Under uniform Acceleration

Question

A body is projected at angle 30⁰ to horizontal on a planet with a velocity of 80 ms^-1. Its time of flight is 4 seconds then acceleration due to gravity on that planet is

Moderate

Solution

$\large T = \frac{{2u\sin \theta }}{g} \Rightarrow 4 = \frac{{2 \times 80 \times \sin {{30}^0}}}{g}$
$\large g = 40 \times \frac{1}{2} = 20m{s^{ - 2}}$

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