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2 years ago

Two bodies of masses M and m(M>m) are allowed to fall from the same height. If

Physics

1 answer:

ollegr [7]2 years ago

5 0

$\sf{\pink{\underline{\underline{\blue{QUESTION:-}}}}}$

<h3>✨ <u>ASSERTION</u> :-</h3>

Two bodies of masses M and m (M>m) are allowed to fall from the same height . If the air resistance for each be the same then both the bodies will reach the earth simultaneously .

For same air resistance, acceleration of both the bodies will be same .

[A] If both assertion and reason are true and reason is the correct explanation of assertion .

[B] If both assertion and reason are true but reason is not the correct explanation of assertion .

[C] If assertion is true but reason is false

[D] If both assertion and reason are false

$\sf{\pink{\underline{\underline{\blue{SOLUTION:-}}}}}$

✍️ The force acting on the body of mass M are [its weight] ‘<u>Mg</u>’

Mg are acting vertically downwards

And air resistance F acting vertically upward .

Hence,

$\rm{\green{Acceleration\:of\:the\:body\:(a)\:=\:\dfrac{Mg\:-\:F}{M}\:}}$

$\rm{\implies\:Acceleration\:of\:the\:body\:(a)\:=\:g\:-\:\dfrac{F}{M}\:}$

⚡ Now, M > m therefore, the body with larger mass will have greater acceleration and it will reach the ground first .

$\green\bigstar\:\rm{\gray{\overbrace{\underbrace{\purple{\therefore\:[D]\:Both\:Assertion\:and\:Reason\:\atop{are\:incorrect\:.}}}}}}$

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3 years ago

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3 years ago

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2 years ago