A car starting from rest, accelerates at the rate f through a distance S, then continues at constant speed for time t and then decelerates at the rate f/2 to come to rest.  If the total distance travelled is 15S then

Question : A car starting from rest, accelerates at the rate f through a distance S, then continues at constant speed for time t and then decelerates at the rate f/2 to come to rest.  If the total distance travelled is 15S then

(a) S = ft

(b) S = (1/6) ft2

(c) S = (1/2) ft2

(d) None of the above

Answer : The right option is (d)

Solution :

A car starting from rest, accelerates at the rate f through a distance S
A car starting from rest, accelerates at the rate f through a distance S

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