Well the first 20-30 meters I did not see you drive hard enough and you just popped up. Keep your head down longer and really pump those arms.
As far as the end of the 40 just let your speed wind down on it’s own… You looked/sounded like you were trying to use your muscles to slow down after the 40; don’t do that, just shut the power off and let your body come to a complete stop on it’s own.