Lee A.

# Rates of Change

An object is moving in a straight line from a fixed point. The displacement s(in metres) is given by s=-2t^2+28t+45, t is greater than or equal to 0, where t is in seconds.

Find t when the object reaches its maximum displacement.

Find the maximum displacement reached by this object.

Determine the acceleration at any time

## 2 Answers By Expert Tutors

By:

Tutor
5.0 (66)

Experienced Physics Teacher for Physics Tutoring

Andy C.

My apologies for the typing error. I put 25 instead of 45.
Report

07/28/17

Arturo O.

We all make those from time to time.  Sometimes I spend more time editing my typos than actually solving the problem!
Report

07/28/17

Andy C.

Speaking for myself, some of us more than others.....I hate it when that happens.
Report

07/29/17

Tutor
4.9 (27)

Math/Physics Tutor

Arturo O.

s(7) = -2(7)^2 + 28*7 + 45 = -98 + 196 + 45 = 143
Report

07/28/17

## Still looking for help? Get the right answer, fast.

Get a free answer to a quick problem.
Most questions answered within 4 hours.

#### OR

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.