Homework Help: physics

Posted by Maihul on Friday, July 6, 2012 at 6:01am.

A car starts from rest and moves along x-axis with constant acceleration (5m/secondsquare) fr 8 sec. If it then countinues with constant velocity. What distance will the car cover in 12 sec since it started frm rest. plz anybody explain me u gave me explaination before also bt it ws no enough plz tell me the answers also.

physics - Maihul, Friday, July 6, 2012 at 6:16am
I think the answer is 360m is it correct experts
physics - Damon, Friday, July 6, 2012 at 6:34am
acceleration period:
v = a t = 5 * 8 = 40 m/s
x = (1/2) a t^2 = 2.5 * 64 = 160 m
this is the initial condition for the constant velocity coasting period:
x = Xi + Vi t + (1/2) a t^2
x = 160 + 40 t + (1/2) 0 t^2
= 160 + 40(12-8)
= 160 + 160
= 320 meters
physics - Maihul, Friday, July 6, 2012 at 6:40am
tnx Mr. Damon
bt i dont think the explaination is fr a class 9th student cn it be mr easy?? as i don't know what is Xi and Vit
physics - Maihul, Friday, July 6, 2012 at 7:25am
I gt it Mr. Damon
tnxx buddy

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