Q12) A 200 g ball is dropped from a height of 30 meters. Assuming no air resistance. Calculate:
a) the potential energy at the initial position?
b) the kinetic energy just before hitting the ground?
c) the velocity of the ball just before impact?
Q13) A student climbs a staircase that is 4 meters high in 8 seconds. If the student’s mass is 60 kg, calculate:
a) The work done against gravity.
b) The power developed by the student.
