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What is the net force on a Merecedes convertible traveling along a straight road at a steady speed of 110 km/hr? Answer in N

Where do i start?

If it takes 1 N to push horizontally on your book to make it slide at a constant velocity, how much force of friction acts on the book? Answer in N

If the book keeps moving at that constant speed i figured that i would be 0 but i was wrong... what am i doing wrong?

Three identical blocks are pulled on a horizontal frictionless surface. If tension in the rope held by the hand is T = 60 N, what is the tension in the other ropes?

Where do i start?

Thanks