A 2.50-kg textbook is forced against a horizontal spring of negligible mass and force constant 250 N/m, compressing the spring a distance of 0.250 m. When released, the textbook slides on a horizontal tabletop with coefficient of kinetic friction μk = 0.30. Use the worker energy theorem to land how far the textbook moves from its initial position before coming to rest. 6.78. Pushing a Cat Your cat "Ms. " (mass 7.00 kg) is trying to make it to the top of a frictionless ramp 2.00 m long and inclined upward at 30.0" above the horizontal. Since the poor cat can't get any traction on the ramp, you push her up the entire length of the ramp by exerting a constant 1000N force parallel to the ramp. If Ms. takes a running start so 1hat she is moving at 2.40 m/s at the bottom of the ramp, what is her speed when she reaches the top of !he incline? Use the work-energy theorem.