posted by kt
You build a toy model of a water slide. A red 250 g toy car slides down a 40 degree frictionless ramp. At the bottom, just at it exists onto a horizontal part of the slide, it collides with a purple 500 g car at rest. How high should you make the water slide so that the red toy car gives the purple car a speed of 250 cm/s? Assume the collision is perfectly elastic.