skelly the child skater is propelled by rocket power. skelly and the rocket together have a mass of 25 kg. when the thrusting force is 100 N and friction is 20 N, a) what will be skellys acceleration? b) how far will he go in 5 s if he starts from rest?

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.