A 4.80-kg watermelon is dropped from rest from the roofof a 25.0-m-tall building and feels no appreciable air resistance.(a) Calculate the work done by gravity on the watermelon duringits displacement from the roof to the ground. (b) Just before itstrikes the ground, what is the watermelon's (i) kinetic energy and(ii) speed? (c) Which of the answers in parts (a) and (b) would bedifferent if there were appreciable air resistance?• To stretch a spring 3.00 cm from its unstretched length,12.0 J of work must be done. (a) What is the force constant ofthis spring? (b) What magnitude force is needed to stretch thespring 3.00 cm from its unstretched length? (c) How much workmust be done to compress this spring 4.00 cm from itsunstretched length, and what force is needed to compress it thisdistance?Work and gravitational/elastic potential energy. (Optional)W = -AU, U = mgh , U = 1/2KX?

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