Page 27 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PSPM SP015

UPS 2014/2015 SF016 No. 2(a)

29. A boy jumps off a stationary canoe onto a jetty. Explain why the canoe moves
backwards. [4 m]

PSPM 2014/2015 SF016/2 No. 3(b)

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30. A 6.25 kg trolley moving with velocity 5.5 m s hits a stationary 1.2 kg trolley. After
the collision the trolleys stick together and move with constant velocity. Calculate

(a) the velocity after collision. [2 m]
(b) the loss of kinetic energy. [2 m]

UPS 2015/2016 SF016 No. 2(b)

31. A block P of mass 6 kg collides head-on with another block Q of mass 10 kg moving at
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the same speed 5 m s . If the blocks sticks together and 187.5 J of energy is lost during
the collision, calculate the

(a) final kinetic energy of the system. [3 m]
(b) final speed of the block. [3 m]

PSPM JAN 2000/2001 SF015/2 No. 11(c)

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32. A red ball R of mass 0.1 kg moves with velocity 0.8 m s at an angle 45 to the x-axis
and collides with a blue ball B of mass 0.2 kg which is at rest as shown in
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FIGURE 3.6. After collision, ball R moves with a speed of 0.5 m s at an angle 20 to
the x-axis, while ball B moves at an angle 
to the x-axis.

R

45 x-axis
B

FIGURE 3.6

(a) Draw a diagram for the system after collision to show the direction of motion of
ball R and ball B. [1 m]
(b) Calculate the momentum before and after collision of each ball R and B. [6 m]

(c) Determine the magnitude and the direction of final velocity of ball B. [2 m]

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