SATHEE: Kinematics Question 522

Kinematics Question 522

Question: A jet airplane travelling from east to west at a speed of 500 $k m h^{- 1}$ ejected out gases of combustion at a speed of 1500 $k m h^{- 1}$ with respect to the jet plane. What is the velocity of the gases with respect to an observer on the ground?

Options:

A)1000 $k m h^{- 1}$ in the direction west to east

B)1000 $k m h^{- 1}$ in the direction east to west

C)2000 $k m h^{- 1}$ in the direction west to east

D)2000 $k m h^{- 1}$ in the direction east to west

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Answer:

Correct Answer: A

Solution:

[a] $\vec{v} A = - 500 \hat{i}$ and $\vec{v} G A = 1500 \hat{i}$

$\Rightarrow \vec{v} G A + \vec{v} A = \vec{v} G A S$

$\Rightarrow \vec{v} G A S = 1500 \hat{i} - 500 \hat{i} = 1000 \hat{i}$

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Kinematics Question 522

Question: A jet airplane travelling from east to west at a speed of 500kmh−1 ejected out gases of combustion at a speed of 1500kmh−1 with respect to the jet plane. What is the velocity of the gases with respect to an observer on the ground?

Options:

Answer:

Solution:

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Question: A jet airplane travelling from east to west at a speed of 500 $k m h^{- 1}$ ejected out gases of combustion at a speed of 1500 $k m h^{- 1}$ with respect to the jet plane. What is the velocity of the gases with respect to an observer on the ground?