Question

A object of mass 4kg is dropped from a height of 20m. Find momentum transferred to the ground.
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Answer 1

Hello!

• Initial velocity, u = 0 ms⁻¹
• Initial momentum = P = mu = 0 ms⁻¹

$\bf{Then}$ :

v = √2gH

⇒ v = √2 × 20 × 10

⇒ v = √400

⇒ $\boxed{\sf v = \sf 20\: ms^{-1}}$

$\bf{Now}$ :

Final momentum = $\sf P_{f} = \sf mv = \boxed{\sf 80 \:kgms^{-1}}$

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