First slide

Projection Under uniform Acceleration

Question

A particle is projected with velocity $\vec{u} = 20 \hat{i} + 30 \hat{j}$ m/s from a point on ground. Then its time of flight is (Take g = 10 m/s²)

Easy

A
18 sec
B
12 sec
C
10 sec
D

6 sec

Solution

T = $\frac{2 (u \sin α)}{g} = \frac{2 \times 30}{10} s = 6 s$

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