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 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?
 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?

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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 ..
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