Recent content by HelpMeHelpYou

whow ! again .. i should study back again .. so thanks Sam .. gratitude !

just a confirmation .. correct this if I'm wrong .. d = 36 a = 0.4 i used : d = V1 t + a t2 /2 subst: 36 = 0 t + 0.4 t2 /2 divide both sides by 0.4 90 = t2 /2 divide both sides by 1/2 45 = t2 square root both sides to remain t : t = 3√5 or 6.7 is it correct usage...

how about the velocity ? Vi = 0 or 4m/s ?

Homework Statement Suppose a child driving a go-cart is traveling 4m/s when she crosses a line 4m from her starting point. She continues with a steady acceleration of 0.4m/s^2 , until she crosses a mark 40m from the starting point. [FONT="Arial Black"]How long does it take for her to go from...

[FONT="Arial Black"]I think I'm going to crazy .. but so very thank you .. now i know how the constant acceleration ..

0^2=25^2+2∗−7.5∗d 0=625-15d (transfer:) 15d=625 divide both sides by 15 to remain the d then, d=41.67m for the second: 0=25+-7.5*t 0=25-7.5t (transfer:) 7.5t=25 divide both sides by 7.5 to remain t: t=10/3s is it wrong ?

to solve for t: i used the second eq. for d: i used the first eq . my t is -17.5s then to my d is -610m then I divide the both to have velocity .. what's next ? :?

my answer was -150m .. and the true answer was 42m only .. I think my brain will be explode .. can you show how to solve EmittingLight ? please ?

the topic was constant acceleration .. then i hardly to understand .. it means i can't understand my teacher .. not only me .. >.<

Homework Statement You are driving your new sports car at a velocity of 90km/hr , when you suddenly see a dog step into the road 50m ahead . You hit the breaks hard to get maximum deceleration of 7.5m/s² . Homework Equations i)How far will you go before stopping? ii)Can you...