Answer to Question #4874 in Mechanics | Relativity for yasmina
muddy incline 90.5 cm long and slides down
to the bottom in 0.50 s.
What net external force acts on the otter
along the incline?
Answer in units of N
F = ma.
All we need is to calculate acceleration a. Why can do it in a such way:
Va = 0.905/0.50 = 1,81 m/s - average speed of an ottet.
We know that V(0) = 0. Also we& know that V(0.5/2) = V(0.25) = Va.
So, a = (V(0.25)-V(0))/0.25 = (Va-0)*4 = 4*Va = 4*1.81 = 7,24 m/s^2.
At last we obtain F = ma = 2.3*7.24 = 16,652 N.
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