Starting from rest, a crate of mass m is pushed up a frictionless slope of angle

Question

Starting from rest, a crate of mass m is pushed up a frictionless slope of angle theta by a horizontal force of magnitude F. Use work and energy to find an expression for the crate's speed v when it is at height h above the bottom of the slope. Express your answer in terms of the variables m, F, theta, h, and free fall acceleration g. Doug uses a 30N horizontal force to push a 3.7kg crate up a 1.7m -high, 20 degree frictionless slope. What is the speed of the crate at the top of the slope? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

30cos20 -3.7gsin20 = 3.7a,,,, a=4.3 m/s^2,,,,,,,,,,,,, V^2 =U^2 -2as,,,,, V^2=0-2*4.3*1.7/sin20,,,,,,,,,V=6.5 m/s

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