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Tried solving the question below but I'm afraid I've done it wrong. Anyone very good...

Tried solving the question below but I'm afraid I've done it wrong. Anyone very good in Physics should help out please

Quest: Determine the instantaneous acceleration in 2sec with a position vector
r(t) = 5t + 10t² + 15t³
********
Sol
finding instantaneous vel. first
Dr/DT
I differentiate the equation
r(t) = 5+20t+45t²
= 5+40+45(2)
= 180m/s
For instantaneous acceleration
= dv/dt
I differentiated again
So, 5+20t+45t²
= 20+45t
20+45(2)
= 110m/s²?
In Physics
3 Answers Available
Asked by Lillyjerry on 15th March, 2019
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995