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A girl pushes herself up a steep ramp in her
wheelchair. She gains a vertical distance of
25.8 m when she reaches the top of the ramp.
She turns around and coasts back down the ramp
If the combined mass of the girl and her wheelchair
is 64.6 kg, what would be her coasting speed at the
bottom of the ramp?!Show all your work.

Sagot :

Okiwixidn

Answer:

22.5m/s, this is assuming conservation of energy and that the girl starts coasting from rest

Explanation:

conservation of energy: mgh = 1/2 m*v^2

h = 25.8m, m = 64.6kg, g=9.81m/s^2

plug in and solve for v

v = sqrt(2gh) = sqrt(2*9.81*25.8) = 22.5m/s

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