Homework Help: physics

Posted by dd on Sunday, June 19, 2011 at 2:20am.

1. The best leaper in the animal kingdom is the puma, which can jump to a height of 12 ft when leaving the ground at an angle of 45°. With what speed, in SI units, must the animal leave the ground to reach that height?

physics - drwls, Sunday, June 19, 2011 at 2:57am
(Vo sin45)^2 = 2 g H
Vo^2 = 4 g H
Vo = 2 sqrt(g H)
g = 32.2 ft/s^2
Vo = 78.4 ft/s = 53.5 mph
physics - S.C.Benjamin, Sunday, June 19, 2011 at 2:58am
0 = (Vcos45)^2 + 2 (-32) 12
v^2 (1/2) = 768
v^2 = 1536
v = 39.2 ft/s
v = 12 m/s
physics - drwls, Sunday, June 19, 2011 at 11:55am
SCB is correct. I made a mistake calculating Vo.
Vo = 39.3 m/s

sin and cos 45 are the same, but in general the sine of the angle from horizontal should be used.

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