Assertion :An external force is not necessarily required to keep a body in uniform motion. Reason: If the net external force is zero, a body at rest continues to remain at rest and a body in motion countinues to move with a uniform velocity.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Newtons' First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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x = 2

x = 1

F = 4 x

t = 0

t = 12

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\frac{1}{4} m ω^{2} A^{2}

\frac{1}{2} m ω^{2} A^{2}

Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

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