Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : The kinetic energy needed to project a body of mass m from earth surface to infinity

Question

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$ Assertion A : The kinetic energy needed to project a body of mass m from earth surface to infinity is $\frac{1}{2} mgR$ , where R is the radius of earth.
Reason $R$ : The maximum potential energy of a body is zero when it is projected to infinity from earth surface.
In the light of the above statements, choose the correct answer from the option given below

Options:

Answer:

A

Solution:

$KE = \frac{1}{2} m (\frac{2 Gm}{R}) = mgR$
Assertion wrong
at $\infty$
$U = 0$
$∴$ Reason correct.

TestHub · Accepted Answer

KE = 2 1 ​ m ( R 2 Gm ​ ) = mgR Assertion wrong at ∞ U = 0 ∴ Reason correct.

Physics - Gravitation Question with Solution | TestHub

Options:

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