Question

A 10kg ball and 20kg ball approach each other with velocities 20 m/s and10 m/s respectively. What are their velocities after collision if the collision isperfectly elastic?​

Answer 1

Answer:

Explanation:Here, m1=10kg,m2=20kg

u1=20m/s,u2=−10m/s,υ1=?,υ2=?

As the collision is perfectly elastic ,

υ1=(m1−m2)u1m1+m2+2m2u2m1+m2

=(10−20)2010+20+2×20(−10)10+20

υ1=−20030−40030=−60030=−20m/s

and υ2=2m1u1m1+m2+(m2−m1)u2m1+m2

=2×10×2010+20+(20−10)(−10)20+10=30030=10m/s

Answer 2

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