Initial Velocity is the velocity at time interval t = 0 and it is represented by u. It is the velocity at which the motion starts. They are four initial velocity formulas: (1) If time, acceleration and final velocity are provided, the initial velocity is articulated as. u = v – at.
(mu s) is the coefficient of kinetic friction, <span> (mu k) is a normal force,</span>
(d) option is right answer
Answer:

Also we know that for cyclic process change in internal energy is always ZERO
Explanation:
First gas is compressed isobarically such that its volume is half of initial volume
So its temperature is also half
So heat given in this process is given as

for diatomic gas we have

so we will have


Now in adiabatic process heat is not transferred
so in this process

so we have



Now it is again reached to original pressure
so temperature will become initial temperature
so heat given in that part

here we know that



So total heat given to the system is


Also we know that for cyclic process change in internal energy is always ZERO
Power is the rate work done given by dividing work done by unit time. It is measured in watts equivalent to J/s.
In this case the force by the student is mg = 490 N (taking g as 9.8m/s²)
Work done is given by force × distance,
Therefore, Power =(force × distance)/ time, but velocity/speed =distance/time
Thus, Power = force × speed/velocity
= 490 N × 1.25
= 612.5 J/S (Watts)
Hence, power will be 612.5 Watts.