Question

A man drops a 10 kg rock from the top of a 20 m ladder. What will be its kinetic energy when it reaches the ground? What will be its speed just before it hits the ground? Does the speed depend on the mass of the rock?

[Take g= 10 m/s²]​

Answer 1

$\huge\bold\pink{Bonjour!!}$

$\huge\mathfrak{Solution:-}$

⏩ Here, u= 0, m= 10 kg, h= 20 m, g= 10 m/s²

As v² - u² = 2gh,

Therefore,

v² - 0² = 2 × 10 × 20

=> v= √400

=> v= 20 m/s

Now, K.E. = 1/2mv²

= 1/2 × 10 × (20)²

= 2000 J. Ans.

→ * The velocity does not depend on the mass of the rock since the acceleration due to gravity under which the rock falls does not depend on it's mass.

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Hope it helps...:-)

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Answer 2

Hey MATE!!!

No the speed of a particle does not depends on its mass.

Answer to your question is in the above attachment.

Please refer to it.

Hope it helps

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HAKUNA MATATA :))