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I was wondering if someone could provide guidance on the following problem? I'd like to arrive at the correct answer(s) and know how I obtained it!

A record of travel along a straight path is as follows:

1. From rest, with a constant accel. of 2.77 m/s^2 for 15.0 s

2. Maintain a const. vel for next 2.05 min

3. Apply neg accel. of -9.47 m/s^2 for 4.39 s

What was total displacement?

What were the average speeds for legs 1, 2, 3 of trip as well as the complete trip?

Any help/guidance would be appreciated - mainly the approach and why it is so. I have a feeling it's the multiple steps that are discouraging...

Thanks in advance!