If you are trying to loosen a stubborn screw from a piece of wood with a screwdriver and fail, should you find a screwdriver for which the handle is longer or fatter?

A fatter handle. This allows you to provide more torque to the screw, which should eventually loosen it.

longer screwdriver

Explanation:

A longer screwdriver will work because it would increase the torque in loosing the screw

Knowing that torque I the product of weight and distance this mean that the more the distance the more the torque that is required to loosen the stew.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6