## Answers

f(x) = 0

-16t^2 + 1500 = 0

t^2 = 1500/16

t = √(1500/16) = 9.68 sec

.f(x)= -16t^{2} + 1500

1500 -16t^{2} = 0

=> t = √(1500/16)

∴ t = 9.682 seconds

.6.82sec.

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