Explanation:
This is one of those great problems that is harder to read than to solve!
Remember the following...
Power is the amount of work done over time.
and that work is Force times distance.
and that Force is just mass times acceleration.
So... nesting all the equations together we might get something that looks like.
We know the power, the time, the acceleration (at this given time) and the mass. We can then solve for d.
Plug and chug!
Answer:
V = 90.51 m/s
Explanation:
From the given information:
Initial speed (u) = 0
Distance (S) = 391 m
Acceleration (a) = 18.9 m/s²
Using the relation for the equation of motion:
v² - u² = 2as
v² - 0² = 2as
v² = 2as
v = 121.57 m/s
After the parachute opens:
The initial velocity = 121.57 m/ss
Distance S' = 332 m
Acceleration = -9.92 m/s²
How fast is the racer can be determined by using the relation:
V = 90.51 m/s