A)

The power used by an object is defined as

where
E is the energy used
t is the time elapsed
In this problem, we have
P = 100 W is the power of the light bulb
t = 1 h = 3600 s is the time elapsed
Solving for E, we find the amount of energy used by the light bulb:

B)

The kinetic energy of an object is given by

where
m is the mass
v is the speed of the object
In this problem, we have a man of mass
m = 65 kg
we want its kinetic energy to be

Therefore, we can calculate its speed from the previous formula:
