Q1. A cannonball launched with an initial velocity of 161 m/s at the angle of 45 degrees follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is it going when it hits the balloon? What is the acceleration of the cannonball just before it hits balloon?
Q2. A 430 g ball swings in a vertical circle at the end of a 1.68-m-long string. When the ball is at the bottom of the circle, the tension in string is 13 N. What is the speed of the ball at that point?