A block is pulled across a rough surface by a tension force 15 degrees above the horizontal. The surface exerts a force of friction of -12 N on the block. What is the force of tension needed to move the block at a constant speed? Round your answer to two decimal places

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.