need help for review PHY 2514: General Plhysies 1-A EXAM 3. Af the Super Bowl co

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need help for review

PHY 2514: General Plhysies 1-A EXAM 3. Af the Super Bowl coin toss, the ref lipped the coin nearly strivght up. above his hand of 0.8 meters. e ref flipped the coin nearly straight up. reaching a masiomum teight (a) With what velocity did he launch the coin? (b) How long was the coin in the air at the maximum height (c) What is the coin's total displacement when the ref catches it? (a) With what velocity did the coin strike the ground if the ref s hand was 1.0 meters above the be zero!) ground when it was released? (NOTE: Be careful about where you set position to Answer. (a)

Explanation / Answer

h = 0.8 m

(a) conservation of energy

m g h = 0.5 m v^2

v = sqrt( 2 g h )

v = sqrt( 2 * 9.81 * 0.8 ) = 3.96 m/s

Launch velocity = 3.96 m/s

(b) v = g t

t = v / g = 3.96 / 9.81 = 0.403 s

Time in air = 0.403 s

(c) Displacement = 0 ( since it returned to the same place )

(d) total height = 0.8 + 1 = 1.8 m

v = sqrt( 2 g h )

v = sqrt(2 * 9.81 * 1.8 ) = 5,94 m/s

Striking velocity of coin = 5.94 m/s

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