1) A man does 4,325 J of work in the process of pushing his 2.70 10³ kg truck from rest to a speed of v, over a distance of 28.0 m. Neglecting friction between truck and road, determine the following.

(a)

the speed v (in m/s)

m/s

(b)

the horizontal force exerted on the truck (in N)

N

2)

As shown in the figure below, a 2.25 kg block is released from rest on a ramp of height h. rough patch WWWWWW 15.0 cm When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.0 cm that has a coefficient of kinetic friction #k = 0.570. Find h (in m) such that the block's speed after crossing the rough patch is 3.60 m/s. (Enter a number.) m