On September 26,1993, Dave Munday, a diesel mechanic by trade, went over the Canadian edge of Niagara Falls for the second time, freely falling 48 m to the water (and rocks) below. On this attempt, he rode in a steel ball with a hole for air. Munday, keen on surviving this plunge that had killed four other stuntmen, had done considerable research on the Physics and engineering aspects of the plunge. During this free fall he fell 48 m. Assuming his initial velocity was zero during the free fall and neglecting the effect of the air on the ball during the fall answer the following questions. (During free fall consider acceleration due to gravity as -9.8 m/s2)
1) How long did Munday fall to reach the water surface below the falls?
2) What was Munday’s velocity as he reached the water surface?
3) What was Munday’s velocity at each count of 1 s (i.e after a period of 1 s)?
4) When do we say that an object undergoes retardation or deceleration?