Question

sin a direction
7.
10. A cricket ball is thrown at a speed of 28 m/s in a dire
30° above the horizontal. Find the distance from the throw
to the point where the ball returns to the same level -
(1) 30 m
(2)42 m
(3) 54 m
(4) 70 m​

Answer 1

Answer:

Given : u=28 m/s θ=30

o

(a) : Maximum height H=

2g

u

2

sin

2

θ

​

⟹ H=

2×9.8

28

2

×0.5

2

​

=10 m

(b) : Time of flight T=

g

2usinθ

​

⟹ T=

9.8

2×28×sin30

​

=2.86 s

(c) : Range R=ucosθ×T

⟹ R=28×cos30° ×2.86=69.27 m