Question

1. A body is thrown with a velocity of 9.8 ms making an angle of 30° with the horizontal. It will hit the
ground after a time
A) 3s
B) 2 s
C) 1.5 s
D) 1 s
2 Astone is just released from the window of a train moving along a horizontal straight track. The stone
will hit the ground following
A) Straight path B) Circular path C) Parabolic path D) Hyperbolic path
8. When air resistance taken into account while dealing with the motion of the projectile. Of the following
properties of the projectile, the one which shows an increase is.
A) range
B) maximum height
C) speed at which it strikes the ground
D) the angle at which the projectile strikes the ground
A body is projected horizontally with speed 20 mis. What will be its speed nearly after 5 seconds? (g =
10 ms
A) 54 mis B) 20 mis C) 50 mis D) 70 m/s
The minimum number of vectors of unequal magnitude required to produce a zero resultant is:
A)
B) 3
C) 4
D) 1
A particle has a displacement of 12m towards east, then 5m towards north and then 6m vertically​

Answer 1

$\huge\red{Answer}$

Total time of flight of a projectile =g2uy

where, uy is the vertical velocity of the projectile =usinθ

Thus, time of flight =g2usinθ

                                =9.82×9.8×sin30∘=1s