Question

ens out. Then
elocity of 20 mg-2
4) 1300 m
9.
and then the parachute opens on
trikes the ground with a velocity of
= 10 ms)
0 m
seconds before the parachute ope
If he bails out of the plane at a he
ound will be
4) 20 ms
te opens out.
a height of
10.
ms
11.
7) 28) 29) 110)
17) 4 18) 219) 320)
7) 1/28) 3 29) 3 30)
12*
s, then (Take g = 10 m/s?).
13.
5 sec
4) none of the above.
Two bodies with masses in the ratio 1: 2 are thrown vertically up with velocities in the ratio -
1. The maximum heights reached by them will be in the ratio
1) 1:1
24:1
Two bodies projected vertically up reach maximum heights 'a' and 'b'.
3) 1:4
projection will be in the ratio
4) 2:1
Their velocities of
1) a : 62
A body is throw up with a velocity
3) a :b
4 da: No
projection is doubled the maximum height it reaches is
u' It reaches maximum height 'h'. If its velocity of
1) 4h 2) h 3) 2h 4) 3h
A body thrown vertically up with some velocity reaches a maximum height of 100m. If another
body of twice the mass of the former is thrown with twice the velocity, the maximum height
reached is
1) 400m'
2) 200m
3) 100m
4) 25m
An object is thrown vertically up with velocity 'u' reaches maximum height in time 't'. The
average velocity during this time is
1) u/2
3) u/g
4) u?/4g
On a planet, a stone thrown vertically up with velocity 10 m/s returns to he ground in 4 second.
Acceleration due to gravity on the planet is
1) 20 m/s
2) 10 m/s?
3) 5 m/s
4) 40 m/s
A stone thrown up with a velocity of 40 m/s from the surface of a planet comes back to the
surface after 20sec. Time taken by the same stone to reach
usec. Iime taken by the same stone to reach the planet when allowed to fall from a
height of 50m is
1) 5 sec
2) 10 sec
3) 20 sec
4) 0.8sec
A body is projected vertically up with velocity 98ms'. After 2s if the acceleration due to gravity
of earth disappears, the velocity of the body at the end of next 3s is
2) 49.6 ms
3) 78.4 ms
4) 94.7 ms


A juggle maintains four balls in motion, making each of the them to rise a height of 20m from his
hand The time interval that he should maintain, for the proper distance between them is (take
g=10m/s)
1) 0.5s
3) 2s
4) 3s
A body projected up reaches a point A in its path at the end of 4th second and reaches the ground
after 5 seconds from the start. The height of A above the ground is (g=10m/s2)
1) 19.6 m
2) 30.6 m
3) 11 m
4) 20 m
A bullet fired vertically up from the ground reaches a height 40m in its path from the ground and
it takes further time 2 seconds to reach the same point during descent. The total time of flight is
(g=10 ms-2)
1) 4 s
2) 3s
3) 6 s
4) 8s
height h after T seconds.
ocity is u​

Answer 1

Answer:

Gauss's theorem states that total electric flux through a closed surface enclosing a charge is 1/ε 0 times of the total charge enclosed by the surface ,

ϕ=Q/ε 0

It is clear that only charge q 2 and q 4

are enclosed by the Gaussian surface therefore only these two charges will contribute to electric flux through the sphere .