5. (a) A constant horizontal force of 4×10 ³ N is acting on an object of mass 10×10
³ kg on a

horizontal surface. The initial velocity of the object is 8.0 m s
-¹
.

Calculate the final velocity

of 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 to

the motion of the object.​

Acarpenter is driving a 15.0-g steel nail into a board. his 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. what is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? the specific heat of steel is 448 j/kg ∙ k. a) 2.7 k b) 1.8 k c) 7.7 k d) 8.1 k e) 3.6 k