A50.0kg box is being pushed along a horizontal surface by a force of 250n directed 28 degrees below the horizontal. the coefficient of kinetic friction between the box and the surface is 0.300. what is the acceleration of the box?

a) 0.769 m/s^2
b) 1.77m/s^2
c) 3.16m/s^2
d) 6.31m/s^2
e) 8.53m/s^2

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.