A sled accelerates down a hill and then slows down after it

Last updated: 7/17/2022

A sled accelerates down a hill and then slows down after it reaches a flat portion of ground. The speed of the sled s (t) (in ft/sec) at a time t (in sec) after movement begins can be approximated by: s(t) = 1.5t for 0≤t≤30 40 / t - 29 for 30<t≤90 Determine the speed of the sled after 20 sec, 30 sec, 40 sec, and 90 sec. Round to 1 decimal place if necessary.