i need the answer for number 3
2. A kid (mass 50kg) is waiting his turn...
2. A kid (mass 50kg) is waiting his turn at the top of a water slide (elevation h - 20m), when he receives the 'go' signal. Assuming no friction, and angle for the slide 8 = -20°, please answer: (a) how much is the gravitational potential energy of the kid while still at the top?. (b) what is the final speed of the kid when he reaches the ground level (h=0)?. Take g = 10m/s2 3. A hydraulic lift raises a heavy elevator weighing 2000 Newtons. The input piston has a 0.02m radius and the lift piston has a 0.04m radius. What minimum force must be applied to the input piston? (9 =10m/s)