# Math - check answer

posted by
**Brownie**
.

Given s = 10 - 10t2 + 45t3, determine the velocity when t = 1 s.

velocity in m/s =

My Answer

S'= 0-20t + 135t^2

S'(1) = -20+135 = 115

velocity in m/s = 115

Can you please confirm this is correct.

Thanks!