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Physics
A projectile is projected with velocity of 25 m / s at an angle θ with the horizontal. After t seconds its inclination with horizontal becomes zero. If R represents horizontal range of the projectile, the value of θ will be: [use g=10 m / s 2 ]
Q. A projectile is projected with velocity of
25
m
/
s
at an angle
θ
with the horizontal. After
t
seconds its inclination with horizontal becomes zero. If
R
represents horizontal range of the projectile, the value of
θ
will be : [use
g
=
10
m
/
s
2
]
5635
146
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Motion in a Plane
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A
2
1
sin
−
1
(
4
R
5
t
2
)
19%
B
2
1
sin
−
1
(
5
t
2
4
R
)
29%
C
tan
−
1
(
5
R
4
t
2
)
10%
D
cot
−
1
(
20
t
2
R
)
42%
Solution:
R
=
g
V
2
(
2
s
i
n
θ
c
o
s
θ
)
t
=
g
V
s
i
n
θ
⇒
V
=
s
i
n
θ
g
t
⇒
R
=
s
i
n
2
θ
g
2
t
2
⋅
g
2
s
i
n
θ
c
o
s
θ
tan
θ
=
R
2
g
t
2
=
R
20
t
2
cot
θ
=
20
t
2
R