An 8 kg ball travelling to the east at 10 ms-1, collides with a 2 kg ball travelling to the west with a velocity of 5 ms. After the collision, they move together. Determine the final velocity of the balls. Assume that there are no resistive forces.
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Answer:
The final velocity of the ball is 5m/s
Explanation:
m1=8kg
u1 =10m/s
m2=5kg
u2=-5m/s
initial momentum before collison
=m1u1+m2u2
=8×10 +5×(-5)
=80-25
=65kg m/s
final momentum after collison
=(m1+m2)×v
=(8+5)×v
=13v
According to the law of conversion of momentum
initial momentum =final momentum
65=13v
13v=65
v=65/13
v=5m/s
Hope it helps
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