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DSE Physics . Mechancis. constant speed. 12 N. 2 N .

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### Energy and Use of Energy

12 N

2 N

A block on a rough horizontal surface is moving to the left with constant speed under two horizontal forces 2 N and 12 N indicated as shown. If the force of 12 N is suddenly removed, what is the net force acting on the block at that instant ?

v /m s−1

4

3

Q

2

1

t /s

P

0

1 2 3 4 5

−1

−2

Two particles P and Q start from the same position and travel along the same straight line. The figure shows the velocity-time (v-t) graph for P and Q. Which of the following descriptions about their motion is/are correct ?

(1) At t = 1 s, P changes its direction of motion.

(2) At t = 2 s, the separation between P and Q is 4 m.

(3) At t = 4 s, P and Q meet each other.

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