Velocity,average velicity,distance

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An automobile traveling at a uniform speed of 55 km/h accelerates to 75 km/h at a rate of 5.4 m/s². To determine the time taken to reach the new speed, the formula for acceleration can be applied. The average velocity during this acceleration phase can be calculated using the initial and final speeds. The distance traveled while accelerating can be found using the appropriate SUVAT equations. Careful attention to unit conversions is essential for accurate calculations.
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An automobile is traveling uniformly at 55km/h. It then accelerates at 5.4m/s squared to 75km/h.

a. How long does it take to reach this new speed?
b. What is the average velocity as it speeds up?
c. How far does it travel while accelerating?
 
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Do you know the equations that relate to uniformly accelerated motion? (Suvat equations)
You will need to take great care with units in this question.
 
my book has many formulas for constant acceleration I don't know whick one to use
 
john stewart said:
my book has many formulas for constant acceleration I don't know whick one to use


Well, think about it for a while. What quantities have you been given already? What is the unknown you're being asked to solve for? What equation will allow you to solve for that unknown quantity using those given quantities?
 

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