stand igend are standing on an ice skating 0.400 kg ball that is traveling horiz

Question

stand igend are standing on an ice skating 0.400 kg ball that is traveling horizontally at throws youa) and b) below, showing governing equations is 1. Suppose you (b) bel i0.0 m/s. Your mass is 70.0 kg. Answer and all work leading to correct answer for credit.. (2 points) results to three significant figures do you and the ball move afterward? State your (2 points) (b) Suppose the ball just hits you and bounces off yo moving at 8.00 m/s in the opposite direction. What is results with three significant figures. chest, so that afterward it is your speed in this case? State lo Conservation of Mechanical Energy and Momentum in Skiing Suppose a man with a mass of 65 kg skis down a frictionless hill that is 5.0 m high. At bottom of hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0 m high ledge in parabolic trajectory motion. Answer questions 2, 3,4 and 5 below. Show all governing equations and correct work neatly for credit. State results with two significant figures. 2.0m (2 points) 2. What is speed of the skier just before he grabs the backpack? use subscripts to distinguish mass of skier and mass backpack. It is a good practice to

Explanation / Answer

2. applying energy conservation,
  
m g h = m v^2 / 2

v= sqrt(2 x 9.8 x 5) = 9.90 m/s

3. Applying momentum conservation,

pi = pf

(65 x 9.90) + (20 x 0) = (65 + 20) v

v = 7.57 m/s

4. yf - yi = v0y t + ay t^2 /2

initial vertical velocity, v0y = 0

0 - 2 = 0 - 9.8 t^2 / 2

t = 0.639 sec

5. in horizontal , a_x = 0

so d = v0 t

d = (7.57)(0.639)

d = 4.84 m

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