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## anonymous one year ago A 70.0 kg sailor climbs a 28.3 m rope ladder at an angle of 45.0° with the mast. How much work did he do? A. 19,400 J B. 686 J C. 1,400 J D. 13,700 J :/

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1. Michele_Laino

the requested work W is: $W = mgd\cos \left( {45} \right) = 70 \times 9.81 \times 28.3 \times \cos 45$

2. Michele_Laino

since we havfe to consider the projection of the weight force, along the direction of the displacement

3. Michele_Laino

have*

4. anonymous

ohh okay! and so we calculate and get 13741? so our solution is D? 13,700 J since it is approximation?

5. Michele_Laino

yes!

6. anonymous

yay!! thank you!!

7. Michele_Laino

ok! :)

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