Homework Help: Physics

Posted by Leah on Monday, March 1, 2010 at 2:53pm.

If a bobsled with a total mass of 250kg, reaches the bottom of the hill at a speed of 92mph, how tall was the hill?

I do not understand how to create the formula. I know that 92mph = 134.933 ft per second & that 1 mile = 5280 ft. Would I take the (92)mph x (5280) ft per mile = (485760ft) and divide it by 1 hour (3600 secs.)? That would give me 134.933 ft.

Physics - bobpursley, Monday, March 1, 2010 at 3:58pm
Work in SI units.

92 mph = 41.12768 meters / second

mgh= 1/2 m (41.13^2)

h= 1/(2g) * 41.13^2)
g= 9.8m/s^2

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