A 4.3 kg ball with a velocity of 3.4 m/s in the +z-direvtion collides head-on el

Question

A 4.3 kg ball with a velocity of 3.4 m/s in the +z-direvtion collides head-on electrically with a stationary 1.0 kg ball. What is the speed of the first ball after the collision? Express your answer using three significant figures. What is the direction of the velocity of the first ball after the collision? What is the speed of the secondary ball after the collision? Express your answer using three significant figures. What is the direction of the velocity of the second ball after the collision?

Explanation / Answer

from conservation of momentum

momentum before collision = momentum after collision

m1 * v1 = (m1 + m2 ) *vf

4.3 * 3.4 = (4.3-1.8) *vf

hence vf = 5.848 m/s

a) speed of the first ball = 5.848 m/s

b) direction of the first ball is -x direction

c) speed of the first ball = 5.848 m/s

d) direction of the second ball is +x direction

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