1) a force of 60.0 N is required to pull a 9.00 kh block of aluminum up a 30.0 degree ramo at a constant velocity. Calculate the coefficientof kinetic friction between the aluminin and ramp. 2) a 0.350kg ball on a string is swung in a vertical circle. At that instant the ball moves through the top of the circle, it has a speed of 6.00m/s. What is the tension in the string? 3) a skateboarder who has a mass of 68.6 kg, comes down a ramp and coast across level roadway. At the bottom of the ramp, the sakteboarder has a speed of 4.92m/s. After coasting for a distance of 35.0m, friction has slowed him down to a soeed of 1.12m/s. What is the work done by friction on the skateboarder? 4) a 61.0 kg boy can run at a constant speed of 1.50 m/s up a set of stairs. The stairs slope upward at an angle of 40.0 degrees to the horizontal. What is the boy's power output? 5) a frictionless cart with a mass of 12.0kg is rolling at a velocity of 0.960m/s [N]. What is the final kinetic energy of the cart if it is acted on by a force of 56.0 N [N] over a displacement of 2.60m [N]