KEAM 2019 Physics and Chemistry Paper

As, we know that, area of acceleration-time (a−t) graph gives the velocity. A plot of variation of acceleration with time is given belowThe velocity at time t=15s
v15= Area of (∆OAE+ABDE)
Similarly, velocity at time t=25s
v25= Area of (∆OAE+ABDE+∆BCD)
=150m/s