For the first answer: greater than. The second answer: A.
Answer:
9.4 m/s
Step-by-step explanation:
We are given that
Height of pile driver above a pile =h=4.5 m
Acceleration due to gravity=
According to law of conservation of energy
K.E=Potential energy



Substitute the values
m/s

Hence, the velocity of pile driver as it hits the pile=9.4 m/s