Answer Happy

In one contest at the county fair, seen in the figure below, a spring-loaded plunger launches a ball at a speed of 3.0 m/s from one corner of a smooth, flat board that is tilted up at a 20° angle. To win, you must make the ball hit a small target at the adjacent corner, 2.50 m away. At what angle should you tilt the ball launcher? 0 200 Launch Target
Block B in figure below rests on a surface for which the static and kinetic coefficients of friction are 0.60 and 0.40, respectively. The ropes are massless. What is the maximum mass of block A for which the system is in equilibrium? 20 kg 45° B 90⁰ A