10. Someone takes 11 minutes to walk up a hill 120m high. His weight is 550N. (a) How much work did he do in climbing the hill?

(b) How many seconds did he take to climb the hill?

(c) What power is developed by his muscles as he climbs?

(d) If he runs up the hill his muscles can exert 500 Watts. How long will it take him to get to the top of the hill?

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?