The decrease in gravitational potential energy of the system is given by

where
m is the mass, g is the gravitational acceleration, and
is the variation of height of the system.
also corresponds to the weight of the diver, therefore if we rearrange the equation and we use
and
, we can find her weight:

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The greater the mass, the greater the fiction generated
Explanation:
the vehicles displacement, since displacement deals with position
Answer:
a) 3-in. pipe
Explanation:
Given that
Fluid flow is in same amount in the same time it means that volume flow rate is same for the pipes
Volume flow rate
Q = A V
A=Area ,V=Velocity

If diameter d is more then the velocity will be less for same volume flow rate .We also Know that if pressure is more then the velocity will be less.
The second pipe 3 in diameter having more diameter then the velocity will be less but the pressure will be more.
That is why the 3 in diameter is having more pressure than 2 in diameter pipe.
Therefore the answer will be a.
a) 3-in diameter pipe