A body is projected at t=0 with a velocity 10 ms−1 at an angle of 60° with the horizontal. The radius of its trajectory at t=1s is R. Neglecting air resistance and taking acceleration due to gravity g=10 ms−2, the value of R is:
(a)
2.5 m
(b)
10.3 m
(c)
2.8 m
(d)
5.1 m
A body is projected at t=0 with a velocity 10 ms−1 at an angle of 60° with the horizontal. The radius of its trajectory at t=1s is R. Neglecting air resistance and taking acceleration due to gravity g=10 ms−2, the value of R is:
(a)
2.5 m
(b)
10.3 m
(c)
2.8 m
(d)
5.1 m
Question ID - 50288 | SaraNextGen Top Answer
A body is projected at t=0 with a velocity 10 ms−1 at an angle of 60° with the horizontal. The radius of its trajectory at t=1s is R. Neglecting air resistance and taking acceleration due to gravity g=10 ms−2, the value of R is:
(a)
2.5 m
(b)
10.3 m
(c)
2.8 m
(d)
5.1 m
|
A body is projected at t=0 with a velocity 10 ms−1 at an angle of 60° with the horizontal. The radius of its trajectory at t=1s is R. Neglecting air resistance and taking acceleration due to gravity g=10 ms−2, the value of R is: |
|||
|
(a) |
2.5 m |
(b) |
10.3 m |
|
(c) |
2.8 m |
(d) |
5.1 m |
1 Answer
127 votes
Answer Key / Explanation : (c) -
=10cos60°=5 m/s
=10cos30°=5
m/s
velocity after t=1 sec
=5 m/s
=
m/s=10−5
an=
⇒
=
=
=2
⇒θ=15°
R=
=2.8m
127 votes
Answer Link
127