Assertion: Space rockets are usually lauched in the the equitorial line from west to east.
Reason: The acceleration due to gravity is minimum at the equatore.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false

Answer

B

Explanation

We know that earth revolves from west to east about its polar axis. Therefore, all the particles on the earth have velocity from west to east.
This velocity is maximum in the equatorial line, as `v =Romega` , where R is the radius of earth and `omega` is the angular velocity of revolution of earth about its polar axis.
When a rocket is launched from west to east in equatorial plane, the maximum linear velocity is added to the launching velocity of the rocket, due to which launching becomes easier.
When a rocket is launched from west to east in equatorial plane, the maximum linear velocity is added to the launching velocity of the rocket, due to which launching becomes easier.