Question

1. An aeroplane starts off on a trip with all 2 engines running. It flies at 850 km/hr. After flying for x hours, the pilot shuts down one engine to conserve fuel. The speed is then reduced to 600 km/hr. The plane flies for a total of 4 hours. a) Write an expression for the time flown at 600 km/hr.​

Answer 1

Relative velocity

V

A/B

=v

A

−v

B

given

V

A/B

=1500Km/h

v

A

−v

B

=1500

v

A

−(−500)=1500

Since the velocity of combustion products and plane are in opposite directions

V

A

=1000km/h