contestada

a parachutist's speed during a free fall reaches 225 kilometers per hour. what is this speed in meters per second? at this speed, how many meters will the parachutist fall during 20 seconds of free fall?

Respuesta :

altavistard
speed = 225 km/hr; convert this to m/sec:

225 km       1000 m     1 hr
----------- * ------------ * --------------- = 62.5 km/sec
    hr             1 km        3600 sec

During the first 20 sec of free fall, the parachutist falls (62.5 km/sec)(20 sec) = 
1250 m.

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