Posted by **Sarah** on Wednesday, May 9, 2012 at 9:08pm.

object A of mass 3g with a velocity of 12cm/s to the east, collides with stationary object B. After collision, object A rebounds with a velocity of 10cm/s to the west and object B has a velocity of 1.5cm/s to the east. Calculate the mass of obeject B

- Physics -
**Elena**, Thursday, May 10, 2012 at 12:38pm
m1 =3 g, v1 =12 cm/s, m2=?, v2 = 0,

u1 = -10cm/s, u2 =1.5 cm.

u1 =(m1-m2) •v1/(m1+m2),

u2 = 2•m1•v1/(m1+m2),

u1/u2 = (m1-m2) •v1/2•m1•v1.

(-10)/1.5 = (3 –m2) •12/2•3•12.

Solving for m2 we obtain

m2 =43 g.

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