Question

A skateboarder with mass m_ s = 52 kg is standing at the top of a ramp which is h_ y = 3.6 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is v_ f= 6.8 m/s. Randomized Variables m_ s= 52 kg h_ y = 3.6 m V_ y= 6.8 m/s Write an expression for the work, w_ f, done by the friction force between the ramp and the skateboarder in terms of the variables given in the problem statement. The ramp makes an angle theta with the ground, where theta = 30 degrees. Write an expression for the magnitude of the friction force, f,, between the ramp and the skateboarder. When the skateboarder reaches the bottom of the ramp, he continues moving with the speed v_ f onto a flat surface covered with grass. The friction between the grass and the skateboarder brings him to a complete stop after 5.00 m. Calculate the magnitude of the friction force. F_ grass in newtons, between the skateboarder and the grass.

Answer 1