Here ,
t = 3.1 s
a) height of cliff = 0.50 gt^2
height of cliff = 0.50 * 9.8 * 3.1^2
height of cliff = 47.1 m
the height of cliff is 47.1 m
b) for the speed of the diver
speed of the diver = gt
speed of the diver = 3.1 * 9.8
speed of the diver = 30.4 m/s
the speed of the diver is 30.4 m/s
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