Example 14 : A car starts from rest and moves along the x-axis with constant acceleration of 10 m/s for 2 seconds. It then continues with constant velocity. What distance will it cover in 5 seconds since it started from rest?
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Answer:
s1=ut+(1/2)at2
=0+21×5×82
=160 m.
The velocity attained in 8 seconds is given by
v=u+at
=0+5×8=40 m/s.
The distance traveled in the next 4 seconds is
s2=40×4=160 m.
So, the total distance traveled by the car is s1+s2=160+160=320 m
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