Kinematics (KVPY Stream-SA (Class 11) Physics): Questions 4 - 5 of 21

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Question number: 4

» Kinematics » Projectile Motion

Appeared in Year: 2012

MCQ▾

Question

A firecracker is thrown with velocity of 30 ms-1 in a direction which makes an angle of 750 with the vertical axis. At some point on its trajectory, the firecracker split into two identical pieces in such a way that one piece falls 27 m far from the shooting point. Assuming that all trajectories are contained in the same plane, how far will the other piece fall from the shooting point? (Take g = 10 ms-2 and neglect air resistance),

Choices

Choice (4) Response
a.

72 m or 99 m

b.

28 m or 72 m

c.

63 m or 117 m

d.

63 m or 144 m

Question number: 5

» Kinematics » Position-Time Graphs

Appeared in Year: 2013

MCQ▾

Question

A man inside a freely falling box throws a heavy ball towards a side wall. The ball keeps on bouncing between the opposite walls of the box. We neglect air resistance and friction. Which of the following figures depicts the motion of the centre of mass of the entire system (man, the ball and the box)?

Choices

Choice (4) Response
a.
 Figure represents motion of center of mass (Choice-A)

Figure Represents Motion of Center of Mass (Choice-A)

Figure represents the motion of mass of the system containing man, ball and box.

b.
Figure represents motion of center of mass (Choice-B)

Figure Represents Motion of Center of Mass (Choice-B)

Figure represents the motion of mass of the system containing man, ball and box.

c.
Figure represents motion of center of mass (Choice-C)

Figure Represents Motion of Center of Mass (Choice-C)

Figure represents the motion of mass of the system containing man, ball and box.

d.
Figure represents motion of center of mass (Choice-D)

Figure Represents Motion of Center of Mass (Choice-D)

Figure represents the motion of mass of the system containing man, ball and box.

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