Page 24 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM 2001/2002 SF015/2 No. 10(a)(ii)

19. A body of mass M moving at velocity u experiences perfect elastic collision with
another body of mass m which is at rest. After collision, M and m move with velocity v 1
and v 2 respectively. By using the principle of conservation of linear momentum and
principle of conservation of kinetic energy, prove that

v 2 = (u + v 1) [5 m]

PSPM 2001/2002 SF015/2 No. 10(b)

-1
20. A blue marble of mass 35 g moving to the right with velocity 8.0 m s collides with a
red marble of the same mass but moving at the opposite direction with velocity
-1
4.0 m s .
(a) Calculate the final velocity of each marble after collision. [6 m]
(b) Determine whether this collision is a perfect elastic collision or not. [2 m]

PSPM 2004/2005 SF017/2 No. 10(c)

-1
21. Object A of mass 8 kg moving at 4 m s collides with another object B of mass 6 kg
-1
moving at 5 m s in the opposite direction. After the collision, object A moves opposite
-1
to its initial direction at 0.1 m s .
(a) What is the velocity of B after the collision? [2 m]

(b) Show that the collision is inelastic. [2 m]

UPS 2005/2006 SF017 No. 3

22.
-1
20 m s

FIGURE 3.2

FIGURE 3.2 shows a ball of mass 0.20 kg moving with a horizontal velocity of
-1
20 m s and hits a wall. After 0.01 s, the ball rebounded with its initial velocity along
the same path.

(a) Calculate the impulse of the ball. [2 m]

(b) What is the average force exerted by the ball on the wall? [2 m]
(c) State whether the collision is elastic or inelastic. Explain your answer. [5 m]

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