Question

77. A stone is projected from the ground with a
velocity of 14 ms- one second later it clears a
wall 2m high. The angle of projection is
(g = 10 ms )
1) 45°
2) 30° 3) 60° 4) 15°
​

Answer 1

Explanation:

vsinθt−

2

1

gt

2

=25

14sinθ×1−5×1

2

=25

14sin=30

sin=

14

30

sinθ>2 not possible

vsinθt−

2

1

gt

2

=2

14sinθ−5=2

14sinθ=7

sin=

14

7

=

2

1

θ=30

o

.

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