A boy rides his skateboard on the empty drainage canal as shown. He starts at the height of 5m and his speed down the ramp is approximated by...

 A boy rides his skateboard on the empty drainage canal as shown. He starts at the height of 5m and his speed down the ramp is approximated by v=(2g(5-y))^(1/2) m/s. What is the normal component of his acceleration at this point?

Please include all units and necessary explanations (i.e. diagrams). Also, if possible, use terms that are appropriate to Dynamics for ease of understanding. Thank you!