45. 25 m
45.50 m
56.00 m
56.25 m
Correct answer is D
h=45t−9t2
dhdt=45−18t=0
45=18t⟹t=2.5s
h(2.5)=45(2.5)−9(2.5)2=112.5−56.25
= 56.25m.
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