Question

The 05:30 flight to Malaga takes off with a mass, including fuel, passengers,

luggage and crew, of 300 000 kg. The gravitational field strength is 10 N/kg.
It climbs to an altitude of 1200 m. If the runway was at an altitude of 220 m,
how much gravitational potential energy has it gained (to the nearest kilojoule)?

Answer 1

Mass = 300 000kg

g = 10N/kg

The height the aeroplane climbed,

∆h = (1200 + 220) m

= 1420m

then,

P.Eg = mgh

= 300 000*10*1420

= 4 260 000 000 J

= 4.26 × 10^6 KJ