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A skydiver descending at 250 km/hr deploys her parachute , which provides an average deceleration of...

A skydiver descending at 250 km/hr deploys her parachute , which provides an average deceleration of magnitude 30 m/s2 over a distance of 80 meters. What is her final speed? (1 km= 1000 m; 1 hr= 60 min; 1 min= 60s)

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Answer #1

To solve this problem, lets convert all the units to SI.

Initial speed

To convert to , we divide by ( number of seconds in an hour), and multiply by ( number of metres in a kilometre).

Since deceleration is negative acceleration

Distance over which it is acting

Therefore, using the kinematic formula for final velocity when acceleration and distance is given

Therefore, the final speed is

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