5. (a) A constant horizontal force of 4×10
³ N is acting on an object of mass 10×10
³ kg on ahorizontal surface. The initial velocity of the object is 8.0 m s
.Calculate the final velocityof the object after it has moved 150 m(i) if the horizontal surface is smooth and,(ii) if the horizontal surface is rough and exerts an opposing force of 200 N tothe motion of the object.