A referee tosses the coin to decide which team has to start the match. If the coin reaches a height of 1 m above the release point which was its initial speed?(assume for simplicity that g = 10 m/s2)
A: About 1 m/s
B: About 20 m/s
C: It is impossible to answer unless the time of flight is given
D: About 3.3 m/s
E: About 4.5 m/s
1
Expert's answer
2018-05-31T07:18:09-0400
V = √(V_0^2-2gh) , where V – velocity at the height of 1 m above the release point (0 m/s) 0 = V_0^2 – 2gh V_0^2 = 2gh V_0^2 = 2×10×1 = 20 V0 = 4.47 (m/s) Answer E: About 4.5 m/s
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