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A parachutist steps from an aircraft, falls freely for two second, and then opens his parachute. Which of the following acceleration time (a-t) graphs best represents his downward acceleration a during the first 5 second?

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answer is C.

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Detailed Solution

The direction of acceleration of the parachutist changes completely from downward to upward after the parachute is opened. The retardation due to the parachute reduces over time as speed decreases.

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