trejoethan
Answered

Looking for answers? Westonci.ca is your go-to Q&A platform, offering quick, trustworthy responses from a community of experts. Experience the convenience of getting reliable answers to your questions from a vast network of knowledgeable experts. Get detailed and accurate answers to your questions from a dedicated community of experts on our Q&A platform.

. A rock is dropped from a height of 4 m. How fast is it going when it hits the ground? The rock has a mass of 2 kg. (Hint: MEi = MEf)

Sagot :

leena

Hello!

When the rock is dropped, it only contains Gravitational Potential Energy, and when it hits the ground, it contains Kinetic Energy.

So:

PE = KE
[tex]\large\boxed{mgh = \frac{1}{2}mv^2}[/tex]

We can rearrange to solve for velocity. Cancel out mass and solve.


[tex]gh = \frac{1}{2}v^2\\\\2gh = v^2\\\\v = \sqrt{2gh}[/tex]

Plug in the givens:


[tex]v = \sqrt{2(9.8)(4)} = \boxed{8.85 \frac{m}{s}}[/tex]

robecornibe

Answer:

8.85 m/s

Explanation:

Thank you for choosing our platform. We're dedicated to providing the best answers for all your questions. Visit us again. Thanks for using our service. We're always here to provide accurate and up-to-date answers to all your queries. Thank you for choosing Westonci.ca as your information source. We look forward to your next visit.