Page 26 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PHYSICS PSPM SEM 1 1999 - 2017

UPS 2011/2012 SF016 No. 2(b)

25.

wall 3.0 m s -1

B A

FIGURE 3.5

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FIGURE 3.5 shows trolley A of mass 2.5 kg moves at constant velocity 3.0 m s
collides with trolley B of mass 3.0 kg which is at rest. After the collision, trolley A
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moves in the opposite direction at constant velocity 2.0 m s while trolley B moves at
constant velocity and hits a wall. The wall exerts an impulse of 18.0 N s on trolley B.
Calculate

(a) the velocity of trolley B after collision with trolley A. [3 m]

(b) the velocity of trolley B after it hits the wall. [2 m]

UPS 2012/2013 SF016 No. 2(b)

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26. An object P of mass 8 kg moving at 4 m s collides with a second object Q of mass
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6 kg moving at 5 m s in the opposite direction. After collision, object P moves in
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opposite direction at 1 m s .

(a) Determine the velocity of object Q after the collision. [3 m]

(b) Show that the collision is inelastic. [3 m]

PSPM 2012/2013 SF016/2 No. 3(c)

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27. Two identical balls with speeds 4 m s and 2 m s collide head-on and stick together.
Calculate their speed after the collision. [3 m]

UPS 2013/2014 SF016 No. 2(b)

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28. An object P moving with velocity 3 m s collides head-on with another object Q of
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mass 6 kg moving with velocity 5 m s in the opposite direction. If the collision is
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perfectly inelastic and the final velocity is 2.5 m s , calculate the

(a) mass of object P. [3 m]
(b) kinetic energy of the system after collision. [3 m]

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