Question 1196741
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(a) How long does it take a car to cross a 30.0 m wide intersection after the light turns green , 
If the car accelerates from rest at a constant of 2.00 m/s^2?
(b) A car starts from rest and accelerates uniformly over a time of 5.21 s 
for a distance of 110 m .determine the acceleration of the car.
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<pre>
(a) Use the formula for a distance at uniformly accelerated rectilinear movement

        D = {{{(at^2)/2}}},     (1)

where D is the traveled distance, "a" is the acceleration, t is the time.


Substitute given values into the formula D = 30 m, a = 2.00 m/s^2

      30 = {{{(2*t^2)/2}}}.


You have an equation for time t. Express t

    t^2 = {{{(30*2)/2}}} = 30;  t = {{{sqrt(30)}}} = 5.48 seconds.


<U>ANSWER</U>.  5.48 seconds.
</pre>

Solved.


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Solve your second problem similarly, starting from the same formula (1).


Or post your second problem separately.


Never pack more than problem per post. It is a rule of this forum.