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no i just forgot to convert 90km/h into m/s 😭

oh i just realised that i did this but i just forgot to convert 90km/h into m/s 😭😭

why??

do i have to find the second derivative to test if there is a maximum turning point when dA/dy is equal to 0?

please help with part b!! this is part of curve sketching using the derivative

i found part a and my answer was a deceleration of 0.6944...m/s, which was correct. i tried solving part b, but i kept getting an answer different from the textbook (the textbook answer is 250m)

this is from the kinematics chapter review in the yr 11 pearson textbook