Q. A butter?y at eye level is 21 cm in front of a plane mirror. You are behind the butter?y, 65 cm from the mirror. What is the distance between your eye and the image of the butter?y in the mirror?
Q. A 110 granite cube slides down a 45 degree frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 235 steel cube at rest. How high above the table should the granite cube be released to give the steel cube a speed of 180cm/s?