A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
A rock is pushed off of a cliff. If air resistance can be neglected, how far will the rock have fallen after 4s? Explain.
anonymous
 4 years ago
A rock is pushed off of a cliff. If air resistance can be neglected, how far will the rock have fallen after 4s? Explain.

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0acceleration due to gravity=9.8 m/s^2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0If the rock is pushed off (supposing the push is in the horizontal direction so it does not affect the motion) then the initial vertical velocity is 0ms^1. gravity is 9.8ms^2 and we have that: \[S= ut + at^2 = 0 + 9.8(4)^2 = 156.8m\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I understand that but I'm not sure I set the equation up right. I used: \[DeltaX=1/2at ^{2}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0sorry, \[S= ut + \frac{1}{2}at^2 = 4.9\times 16 = 78.4m\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Okay so the 1/2 is right?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0that is the formula one should use...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Yeah, the 1/2 is correct there in that formula. \[S= ut + \frac{1}{2}at^2\] Where S is the distance, u is the initial velocity, t is time and a is acceleration.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I remember I proved it once but can't remember the other formulae I used in the proof, it's just a substitution thing anyway
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.