what is the duration during which the car moves with constant velocity?
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Correct option is (A)
175 m
For constant velocity :
Constant velocity u=10 m/s
Time t=10 s
So, displacement in 10 seconds S1=ut=10×10=100 m
For accelerated journey :
Initial speed u=10 m/s
Acceleration a=2 m/s2
Time t=5 s
Displacement in 5 seconds, S2=ut+21at2
⟹ S2=10×5+21×2×52=75 m
Total displacement in 15 seconds Stotal=100+75=175 m
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