7. A 2.50 kg block is pushed against a spring with negligible mass andforce constant of 450 N/m, compressing the spring to 0.230 m.When the block is released, it moved along a frictionless, horizontalsurface and then up a frictionless incline with slope 35.0° (as shownin Figure 3.9). (a) What is the speed of the block as it slides alongthe horizontal surface after having left the spring? (b) How far doesthe block travel up the incline before starting to slide back down?0.23 m2.5kg135Fig. 3.98. A 62.0 kg skier starts from rest at the top of a ski slope 55.0 mhigh. (a) If the frictional forces do -9.80 kj of work on her as she descends, how fast is she going atthe bottom of the slope? (b) Now moving horizontally, the skier crosses an 85.0 m wide patch of softsnow, where uk = 0.31. How fast is she moving after crossing the patch?

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