10 QA on projectile motion | Learn Physics

10 Question-Answer on projectile motion

1.       A particle having a mass 0.5 kg is projected under gravity with a speed of 98 m/s at an angle of 60ᵒ. The magnitude of the change in momentum in kg m/s of the particle after 10 second is?

(a)    490

(b)   98

(c)    49

(d)   0.5

Ans:( c)

2.       The range of a projectile fired at an angle of 15ᵒ is 50 m. If it is fired with the same speed at an angle of 45ᵒ, its range will be?

(a)    25 m

(b)   50 m

(c)    100 m

(d)   77.6 m

Ans: (c)

3.       Which of the following remains constant for a projectile fired from the earth?

(a)    Momentum

(b)   Kinetic energy

(c)    Vertical component of velocity.

(d)   Horizontal component of velocity.

Ans: (d)

4.       Which of the following does not affect the maximum height attained by projectile?

(a)    Acceleration of the projectile

(b)   Magnitude of initial velocity

(c)    Mass of projectile

(d)   Angle of projection

Ans: (c)

5.       In case of a projectile, what is the angle between the instantaneous velocity and acceleration at the highest point?

(a)    45ᵒ

(b)   180ᵒ

(c)    90ᵒ

(d)   0ᵒ

Ans:(c )

6.       A passenger travelling in a train moving with a constant velocity drops a stone from the window. To a passenger the path of projectile will appear to be

(a)    Elliptical

(b)   Parabolic

(c)    Are of a circle

(d)   Straight line

Ans:(d)

7.       A projectile is projected at an angle of 15ᵒ to the horizontal with some speed v. If another projectile is projected with the same speed, the it must be projected at what angle with the horizontal so as to have the same range.

(a)    It is never possible

(b)   12.5ᵒ

(c)    75ᵒ

(d)   65ᵒ

Ans:(c)

8.       Two balls are projected at the angle θ and (90ᵒ- θ) to the horizontal with the same speed. The ratio of their maximum vertical height is

(a)    1:1

(b)   Tan θ:1

(c)    1:tan θ

(d)   Tan² θ : 1

Ans: (d)

9.       A body is projected horizontally with speed 20 m/s from top of a tower. What will be its speed nearly after 5 sec? Take g = 10 m/s²

(a)    54 m/s

(b)   20 m/s

(c)    50 m/s

(d)   70 m/s

Ans : ( a)

10.   A projectile is thrown  with an initial velocity of 50 m/s. The maximum horizontal distance which this projectile can travel is

(a)    64 m

(b)   128 m

(c)    5 m

(d)   255 m

Ans : (d)