Question

Since the book bag slide on the car seat, what is the coefficient of friction between the book bag and the car seat. Note that this requires information from problem 8. Motion or Energy: If a ball is thrown into the air at a 30 degree angle with a total velocity of 10 m/s (vertical 5m/s, horizontal 8.66 m/s) how high will it go, how long will it take to hit the ground again and how far did it go? 1.02m 1.27m 2.55m 8.66m 10.2m

Answer 1

V0x = 8.66 m/s

V0y = 5 m/s

at the maximum height

vertical component vy = 0

displacement y = H

vy^2 - v0y^2 = 2*ay*g

v0y^2 = 2*g*H

H = v0y^2/(2*g)

H = 5^2/(2*9.8)

H = 1.27 m

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after falling on the ground

along vertical

total displacement y = 0

y = v0y*T + (1/2)*ay*T^2

T = 2*V0y/g

time T = 2*v0y/g = 2*5/9.8 = 1.02 s

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along horizantal

ax = 0

X = V0x*T + (1/2)*ax*T^2

X = V0x*T

X = V0x*2*V0y/g

X = 8.66*2*5/9.8 = 8.84 m

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