A jet airplane travelling from east to west at a speed of 500 km h-1 ejected out gases of combustion at a speed of 1500 km h-1 with respect to the jet plane. What is thevelocity of the gases with respect to an observer on the ground?
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a
1000 km h-1 in the direction west to east
b
1000 km h-1 in the direction east to west
c
2000 km h-1 in the direction west to east
d
2000 km h-1 in the direction east to west
answer is A.
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Detailed Solution
v→A=−500i^ and v→GA=1500i^⇒v→GA+v→A=v→GAS⇒v→GAS=1500i^−500i^=1000i^