Homework Help: physics

Posted by j on Thursday, June 7, 2012 at 9:44pm.

A car starts from rest and travels for 6.3 s with
a uniform acceleration of 2.3 m/s2. The driver
then applies the brakes, causing a uniform
acceleration of −1.9 m/s2.
If the brakes are applied for 2.6 s, how fast
is the car going at the end of the braking
period?

physics - Elena, Friday, June 8, 2012 at 5:36am
vₒ=a1•t1 = 6.3•2.3 =14.49 m/s
v=vₒ-a2•t2 = 14.49 – 1.9-2.6 = 9.55 m/s

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