Homework Help: physics

Posted by Anonymous on Monday, January 21, 2013 at 2:37am.

A car starts from rest and travels for 7.0 s with a uniform acceleration of +2.3 m/s2. The driver then applies the brakes, causing a uniform negative acceleration of -1.0 m/s2. If the brakes are applied for 2.0 s, how fast is the car going at the end of the braking period, and how far has it gone?

physics - bobpursley, Monday, January 21, 2013 at 5:00am
break up the question into segments
a. travels for 7.0 s with a uniform acceleration of +2.3 m/s2
b. then applies the brakes, causing a uniform negative acceleration of -1.0 m/s2. If the brakes are applied for 2.0 s,

figure the end velocicty of a, which will be the starting velocicty of b, then find the end velocity.
distance can be found in each, and added.

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