A boy, with a mass of 48.0 kg, rides a skateboard with a mass of 3.00 kg on a horizontal road. At the top of an incline, his velocity is 1.30 m s. He rides down the incline and reaches the bottom with a velocity of 3.40 m s. The difference in height between the top and the bottom of the incline is 0.540 m. Calculate the average resistive force while the boy rode down the incline. 1.30 m/s तं 3.40 m/s तं 0.540 m 38.0 m

as a fish jump vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. a force chinook salmon has a length of 1.50 m and a mass of 48.5 kg. if the fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 5.80 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine the following. a. the salmon's  acceleration b. the magnitude of the force F during this interval

A 50.0kg object is pushed across a level surface with a diagonal force of 550 N causing it to move forward at a constant velocity of 6.00 m/s. Calculate the coefficient of kinetic friction

A 20-Mg train is traveling at a speed of 50 m/s at an angle of 10o. But the driver noticed that the bridge 300-m ahead is missing. At once, he pulls the break, thus applying a frictional resistance of Ff = 1000 N. At the same time Super Botting pushes back the train with a force of Fs=(123)d +100, where d is the distance that the train travels before stopping. Determine the stopping distance d, and mention whether or not Superperson would be able to save the train.