In which of the following cases does a car have a negative velocity and a positive acceleration? A car that is traveling in the: a. -x direction decreasing in speed
b. +x direction increasing in speed
c. -x direction increasing in speed
d. +x direction decreasing in speed
e. -x direction at a constant 20 m/s

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.