A body starts from rest and moves with uniform acceleration of 10ms for 5s.during next 10s it moves with uniform velocity.it is brought to rest in 3s by applying uniform retardation.What is the average velocity of body for the whole path?
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Explanation:
The initial velocity travelled is 625m
The accleration is α=10m/s2
The time is t=5s
Apply the equation of motion
v=u+at
The velocity is v=0+10.5=50m/s.
The distance travelled in the first 5s is
s=ut+21at2=0.5+21.10.52=125mThedistancetravelledinthefollowing10siss1=ut1=50.10=500mThetotaldistancetravelledisd=s+s1=125+500=625m
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