Sunday
December 21, 2014

Homework Help: Physics

Posted by Lucy X on Tuesday, April 28, 2009 at 10:12pm.

A 0.25-kg ball is attached to a 26-cm piece of string. The ball is first raised so that the string is taut and horizontal, then the ball is released so that, at the bottom of its swing, it undergoes an elastic head-on collision with a 0.21-kg ball that is free to roll along a horizontal table.

a) What is the speed of the swinging ball just before the collision? (Answer: 2.3 m/s)
b) What is the speed of the 0.21-kg ball just after the collision? (Answer: 2.5 m/s)
----------

It's an elastic collision, so I know that total energy and momentum are conserved.
I think I need to write two equations (one for kinetic energy and one for momentum), but I don't know how... :S

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics - Imagine that you swing about your head a ball attached to the end of a...
physics - A tetherball leans against the smooth, frictionless post to which it ...
physics - A tetherball leans against the smooth, frictionless post to which it ...
College Physics - a 5.63kg ball hangs from a vertical pole by a 2.4 long string...
Physics Help - A ball of mass 1.76 kg is tied to a string of length 4.19 m as ...
Physics - A ball on a 6.5 m long string swings down and wraps around a post that...
Physics...... - A ball on a 6.5 m long string swings down and wraps around a ...
physics - A ball(mass=3kg) is attached to 2 strings and it is rotated by one ...
Physics. LAST PROBLEM!! - A small metal ball with a mass of m = 82.5 g is ...
physics - A ball of mass 3.0 kg is tied to the end of a 50-cm length of string. ...

Search
Members