A car is moving horizontally along a straight line. A ball is projected from this car in such a way that it will return to it after it has maoved 100m .the speed of the ball is
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Answer
Range
=
60
3
=
g
u 2
ucosθ=
30−
(1)
⇒
60
3
=
g
2u
2
sinθcosθ
⇒
30
3
=
g
(2usinθ)×30
⇒
10
3
=
2usinθ
⇒
usinθ=
5
3
−
(2)
Solve (1) & (2) we get
u=
20
3
;θ=
30
0
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