Answer :
The power supplied by the second crane, which lifts a car of mass 2000 kg up a distance of 30 m in 2 minutes, is 4900 W that is option A.
To calculate the power supplied by the second crane, we first need to determine the work done by the crane. The work done by the crane in lifting the car is given by the gravitational potential energy formula:
Work done (W) = mass (m) imes gravitational acceleration (g) imes height (h)
W = 2000 kg imes 9.8 m/s2 imes 30 m
W = 588,000 J (joules)
Next, we use the formula for power (P), which is work done (W) divided by time (t):
P = W / t
Because the second crane does the job in 2 minutes (120 seconds), we divide the total work by this time duration:
P = 588,000 J / 120 s
P = 4900 W
Hence, the power supplied by the second crane is 4900 W, which corresponds to option A).