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)
Homework Answers
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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