35. A crane does

500J

of work to lift a box a vertical distance of

8.5m

. Calculate the mass of the box.\ (a)

22kg

\ (b)

6.0kg

\ (c)

55kg

\ (d)

17kg

\ (e)

11kg

\ 36. A

90kg

box sits on a horizontal surface. What horizontal force must be applied to the box to move it\ at constant speed if the coefficient of friction between box and surface is 0.57 ?\ (a)

840N

\ (b)

974N

\ (c)

503N

\ (d)

61.3N

\ (e)

122N

35. A crane does 500J of work to lift a box a vertical distance of 8.5m. Calculate the mass of the box. (a) 22kg (b) 6.0kg (c) 55kg (d) 17kg (e) 11kg 36. A 90kg box sits on a horizontal surface. What horizontal force must be applied to the box to move it at constant speed if the coefficient of friction between box and surface is 0.57 ? (a) 840N (b) 974N (c) 503N (d) 61.3N (e) 122N