Question
A heavy ball A of mass 10kg is moving at a velocity of 10m/s to the right. When it hits a stationary ball B of mass 5kg, ball B moves at a velocity of 10m/s to the right.
a) explain whether it is inelastic collision or not.
a) explain whether it is inelastic collision or not.
Answers
First, use conservation of momentum to find the velocity of ball A AFTER the collision, Va2.
10kg*10m/s = 5kg*10m/s + 10kg*Va2
Va2 = 50/10 = 5 m/s
Then, compare the sum of kinetic energies before and after collision.
before: KEtotal = (1/2)*10*10^2 = 500 J
after: KEtotal = KE(A) + KE(B) = ___
If the total KE decreases, the collsion is ineleastic. Do the numbers and find out if it is.
10kg*10m/s = 5kg*10m/s + 10kg*Va2
Va2 = 50/10 = 5 m/s
Then, compare the sum of kinetic energies before and after collision.
before: KEtotal = (1/2)*10*10^2 = 500 J
after: KEtotal = KE(A) + KE(B) = ___
If the total KE decreases, the collsion is ineleastic. Do the numbers and find out if it is.
retetetgrhehhe
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