A child starts at rest and slides down a frictionless slide as in picture. The bottom of the track is a height h above the ground. The child then leaves the track horizontally, striking the ground at a distance d as shown. (a) Using conservation of energy, find the speed of the child at the end of the slide (b) Using your answer to part (a) and equations related to a projectile, determine the initial height H of the child above the ground in terms of h and d. Н d
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- Solution to HW problem with all work and explanation, please.Consider the skateboarder in the Figure. If she has a mass of 55 kg, an initial velocity of 20 m/s, and a velocity of 12 m/s at the top of the ramp along horizontal direction. After that she flies into the air and strikes the ground. (Ignore air friction and the kinetic energy of the skateboard) a)What is the work done by friction on the skateboarder? (b)Calculate the flight time of the skateboarder. (c)Calculate the velocity at which she strikes at theA 58.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 128 m/s from the top of a cliff 116 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile? (Give your answer to at least three significant figures.) 541070.4 J (b) Suppose the projectile is traveling 90.7 m/s at its maximum height of y done on the projectile by air friction? -139371.4 J = 287 m. How much work has been (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up? 81.5 m/s