I am using the College Physics textbook. I am studingKinematics and don\'t under

Question

I am using the College Physics textbook. I am studingKinematics and don't understand it fully. I don't understandhow to apply the different equations to help me with theproblem. Please read the question and any help would be greatlyappreciated. A car with an inital velocity of 3.5m/s coasts with the engineoff and the transmission in neutral. If the combined effect of airresistance and rolling friction causes constant deceleration of0.50 m/s2, after how long a time will the car come to astop? I am using the College Physics textbook. I am studingKinematics and don't understand it fully. I don't understandhow to apply the different equations to help me with theproblem. Please read the question and any help would be greatlyappreciated. A car with an inital velocity of 3.5m/s coasts with the engineoff and the transmission in neutral. If the combined effect of airresistance and rolling friction causes constant deceleration of0.50 m/s2, after how long a time will the car come to astop?

Explanation / Answer

we can use the kinematic equation V=U+at where V=final velocity=0(given as the car stopseventually) U=initial velocity=3.5m/s a=acceleration or deceleration=0.5 but we have to change the sign as (-a) as the decelerationacts in the opposite direction so the equation becomes, 0=3.5-0.5t so t=7 secs hope it helped. just remember the basic equations of kinematics and try toanalyse the problem given in terms of the values given. so you can decide which equation to use.

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