As we know that :

Power, is in Meter. So divide focal length by 100

Well, if there were no air resistance, then a helicopter couldn't fly. But let's do the physics and the Math anyway:
The way gravity works, the speed of a falling object increases at the rate of 9.8 m/s every second.
So, after falling for 12 seconds, its speed is (12 x 9.8) = <em>117.6 m/s </em>.
use a = (v1-v2)/t so u would put 14 (initial velocity or v 1) - 6 (the v2) and divide all of that by 4 seconds to get 2m/s/s as your acceleration
Answer:
The speed of sound in <u> Steel </u>is greater than the speed of sound in water.