mass of an aeroplane is 480 quintal it starts from rest and develops a speed of 42ms^-1 just before take off if the length of the runaway is 2 km calculate the power
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We know
Work done=Change in Kinetic energy(K.E(final)-K.E(initial))
Initial speed is 0 ... 1 quintal=100kg
Therfore work done=1/2mv^2=1/2*48000*42=1,008,000J
v=42m/s,u=0m/s, s=2000m
v^2=u^2+2as, 1764=0+4000a
therfore a=1764/4000=0.441
v=u+at, 42=0.441t, t=42/0.441=95 sec
Power=Work done/time=1,008,000/95=10,610W
therfore power=10,610W
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