A community for students.
Here's the question you clicked on:
 0 viewing
abz_tech
 2 years ago
A body leaves a point A and moves in a straight line with a constant velocity of 40 m/s. Ten seconds later another body which is at rest at A is given an acceleration of 2 m/s and moves in the same direction as the first body. How long does it take the second body to catch up with the first? How far from A does this occur?
abz_tech
 2 years ago
A body leaves a point A and moves in a straight line with a constant velocity of 40 m/s. Ten seconds later another body which is at rest at A is given an acceleration of 2 m/s and moves in the same direction as the first body. How long does it take the second body to catch up with the first? How far from A does this occur?

This Question is Closed

abz_tech
 2 years ago
Best ResponseYou've already chosen the best response.0umm formulas u might need: v=u+at s=ut+1/2t^2 v^2=u^2 + 2as .. damn it can't get y head around the 10 sec part =/.. help would be really appreciated

Asylum15
 2 years ago
Best ResponseYou've already chosen the best response.1Write down what you know first: Body leaving Point A: v = 40 m/s a = 0 (since its got a constant velocity, it has no acceleration) Body 2 leaving Point A: u = 0 (initial velocity) a = 2 m/s t = 10 secs In the first part you need to find t (time) In the second part you need to find s (distance)

abz_tech
 2 years ago
Best ResponseYou've already chosen the best response.0how exactly would i sub it in?

Asylum15
 2 years ago
Best ResponseYou've already chosen the best response.1s = ut + ½ at² We'll let the time taken for the second body to catch the first be t. So, for the first body: s = 40(t + 10) (since this body has a 10second start).

Asylum15
 2 years ago
Best ResponseYou've already chosen the best response.1And, for the second body: s = ½(2)t² = t² When the second body catches the first these two distances are equal. So t² = 40t + 400 Or t²  40t  400 = 0

abz_tech
 2 years ago
Best ResponseYou've already chosen the best response.0pnaa get it now.. never thought of using brackets lol.. continue plz =P

Asylum15
 2 years ago
Best ResponseYou've already chosen the best response.1Well, you have a quadratic there. Which gives t = 48.2842712474619s (since t >0) Substitute this value back into the first equation for s to get s = 2331.3708499m To a sensible degree of accuracy t = 48.3s and s = 2330m

abz_tech
 2 years ago
Best ResponseYou've already chosen the best response.0dude, how did u get 48.28 ?.. when i do the quadratic.. dont even get close to it ..
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.