A ball moving on a horizontal frictionless plane hits an identical ball at rest with a velocity of `0.5m//s`. If the collision is elastic, calculate the speed imparted to the target ball, if the speed of projectile after the collision is `30cm//s`. Show that the two balls will move at right angles to eachother, after the collision.

Options

A. `20 cm s^(-1)`
B. `30 cm s ^(-1)`
C. `40 cm s ^(-1)`
D. `50 cm s ^(-1)`

Answer

C