v = Vi + a t
so at top
0 = 20 - 9.81 t
solve for t at top
T = time in air = 2 t
h = h of hand + 20 t - 4.9t^2
solve for h
v at hand = -20 by symmetry
I do not know how high his hand was so can say nothing about ground
A boy tosses a coin upward with a velocity of 20m/s
What will be the maximum height?
Time of flight?
Velocity as it returns to the hand?
Velocity as it hits the ground?
1 answer
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