A 30.00 kg block starts from rest at the top of a 23.0 m long 30.0° incline. Its kinetic energy at the bottom of the incline is 3381 J. ?
How much work is done by friction?
- billrussell42Lv 71 month ago
the height is 23 sin 30 = 11.5 m
PE = mgh = 30 x 9.8 x 11.5 = 3381 J
since that equals the KE at the bottom, there is no friction, no work done by it.
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