1) after a pleasant day at the beach, you carry your 16-kg surfboard across the

Question

1) after a pleasant day at the beach, you carry your 16-kg surfboard across the parking lot to your car, a distance of 49.0 m. what is the work done by you on the surfboard

2) After reaching your car, you lift your 16 kg surf board up by 1.7 m to put it on the roof top carrier. What is now the work done by you on the surfboard?

3) A child weighs 335 N. What is the child's mass?

4) A weight lifter raises a 89-kg barbell to a height of 2.1 m. What is the barbell's change in potential energy?

Please show work!! Thank you so much. I always rate.

Explanation / Answer

1. work = F*S = 16*9.8*49 = 7683.2 J

2. work = mgh = 16*1.7*9.8 = 266.56 J

3. Weight = mg

m = 355/9.8 = 36.22 kg

4. Potential energy = mgh = 89*9.8*2.1 = 1831.62 J

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