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Find the average velocity for the time i...

Find the average velocity for the time intervals `Deltat=t_(2)-0.75` when `t_(2)` is 1.75 ,1.25 and 1.0 s. What is the instantaneous velocity at t=0.75 s?

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About 2 `ms^(-1),2.7ms^(-1),3.2ms^(-1),4.0 ms^(-1)` from slope at 0.75 s
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AAKASH SERIES-MOTION IN A STRAIGHT LINE -Numerical exercise(LEVEL-1)
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