17. When an object is released from rest and freefalls, which of the following is true concerning its motion? Question 17 options:

a)	The speed of the falling object is proportional to its mass.

b)	The speed of the falling object is proportional to its weight.

c)	The speed of the falling object is inversely proportional to its surface area.

d)	None of the above is true.

18. An object of mass 3000 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 20 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab? Question 18 options:

a)

83.7 m

b)

20 m

c)

40 m

d)

66.7 m