First slide

Projection Under uniform Acceleration

Question

A gun fires a bullet at a speed of 140m / s. If the bullet is to hit a target at the same level as the gun and at 1km distance, the angle projection

Moderate

A

30°
B

75°
C

45°
D

53°

Solution

R = 1000 m U = 140 m/s
$\begin{array}{l} R = \frac{U^{2} \sin 2 θ}{g} \\ 100 \times 9 .8 = 140 \times 140 \sin 2 θ \\ 2 θ = 30^{\circ} θ = 15^{\circ}, (90 - 15) = 75^{\circ} \end{array}$
also have the same range.

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