Question

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A car moves along a straight line with uniform acceleration of 15m/s^2 for 10 seconds and with uniform acceleration for 20m/s^2 for next 15 seconds. Find the average acceleration.

Answer 1

Average acceleration =sum of velocity,,÷Te taken

so,15+20/10+15

So,35/25=7/5

so, AVERAGE accelerationis
$\red{\huge{1.4m/S^2}}$

Answer 2

20
$20 \sqrt{15 } \div 15 =$
$15 \sqrt{10} \div 10$
average acceleration = 20root15/14 + 15root 10 /10
now solve