Space, Time and Motion
Theme A : Space Time and Motion
Questions Attempted 0/2
Space, Time and Motion
Available time 20 Minute(s)
01

Two balls, X and Y, move along a horizontal frictionless surface.

02

The kinetic energy of the car is unchanged after the collision. 

Theme A : Space Time and Motion
:
Available time 20 Minute(s)
01. Question
Level Easy
Maximum Mark 9
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Two balls, X and Y, move along a horizontal frictionless surface, as illustrated below.

Ball X has an initial velocity of 3.0ms–1 in a direction along line AB. Ball Y has a mass of 2.5kg and an initial velocity of 9.6ms–1 in a direction at an angle of 60° to line AB.

The two balls collide at point B. The balls stick together and then travel along the horizontal surface in a direction at right-angles to the line AB, as shown below.

(a) By considering the components of momentum in the direction from A to B, show that ball has a mass of 4.0kg.

[Marks: 3]

(b) Calculate the common speed V of the two balls after the collision.

[Marks: 3]

(c) Determine the difference between the initial kinetic energy of ball X and the initial kinetic energy of ball Y.

[Marks: 3]
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