*ball 2 with with a mass of 30 kg is moving to the left at 10 m/s with that velocity should ball 1 with a mass of 10 kg move to the right and collide with 2 so that ball 1 rebound with a velocity of 30 m/s and ball 2 with velocity of 10 m/s after the collision assume the collision to be perfectly elastic.

"momentum"

SHOW WORK PLZ

Question

*ball 2 with with a mass of 30 kg is moving to the left at 10 m/s with that velocity should ball 1 with a mass of 10 kg move to the right and collide with 2 so that ball 1 rebound  with a velocity of 30 m/s and ball 2 with velocity of 10 m/s after the collision assume the collision to be perfectly elastic.

"momentum"

SHOW WORK PLZ

aravindg · Answer

what we need to find here?

anonymous · Answer

velocity of ball 1

aravindg · Answer

do u knw formula for finding this ?

anonymous · Answer

yes but I plug it in wrong it confuses me a lot.

amistre64 · Answer

you have before and after speeds given, and the masses dont change; so the mvs before have to equal the mvs after right?

anonymous · Answer

yes

amistre64 · Answer

m1v1 + m2v2 = m1V1 + m2V2

m1 = 10 kg
v1 =
V1 = -30 m/s

m2 = 30 kg
v2 = -10 m/s
V2 = 10 m/s

amistre64 · Answer

10v + 30(-10) = 10(-30) + 30(10)

10v -300 = -300 + 300

10v  = 300

ifi havent misread it right?

anonymous · Answer

300/10 = 30 
so the velocity is 10 
thankyou very much! :D

amistre64 · Answer

hope it worked :)