Question

Two small glass spheres of mass 10g and 20g are moving in a straight line in the same direction with the velocities of 3m/s and 2m/s respectively. They colied with each other and after collision, glass sphere of mass 10g moves with a velocity of 2.5 m/s. Find the velocity of second ball after collision.ANSWER IT FAST EXTREMELY URGENT.

Answer 1

initial momentum of first spheres = mv = 0.1×3=0.3kg m/s

initial momentum of second sphere = mv = 0.2×2 = 0.4kg m/s
After the collision
final momentum of first sphere= mv = 0.1×2.5=0.25kg m/s
final momentum of second sphere =mv =0.2×v = 0.2kg m/s
initial momentum = final momentum
0.3+0.4 = 0.25 + 0.2v
0.7 = 0.25 +0.2v
0.45 = 0.2v
v= 2.25m/s

Answer 2

m1u1+m2u2=m1v1+m2v2
10×3+20×2=10×2.5+20×v2
v2=2.25