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1.
A body of mass 
moving along a straight line covers half the distance with a speed of 
The remaining half of distance is covered in two equal time intervals with a speed of 
respectively. The average speed of the particle for the entire journey is
moving along a straight line covers half the distance with a speed of The remaining half of distance is covered in two equal time intervals with a speed of respectively. The average speed of the particle for the entire journey is
2.
Equation of displacement for any particle is 
. Its acceleration at time 
is
. Its acceleration at time is
3.
A person travels along a straight road for the first half time with a velocity 
and the next half time with a
velocity
The mean velocity V of the man is
and the next half time with avelocity
The mean velocity V of the man is