ANSWER:
(i)
(a) 0 m/s²
(b) 1.6 m/s²
(c) 0.8 m/s²
(ii)
(a) 0 m/s²
(b) 1.6 m/s²
(c) 0 m/s²
Explanation:
(i)
We have that the acceleration is given as follows:
(a) 0 s to 5 s:
(b) 5 s to 15 s:
(c) 0 s to 20 s:
(ii)
The instantaneous acceleration is given as follows:
(a) 2 sec (No slope so acceleration at 2 sec is 0 m/s²). We confirm it as follows:
(b) 10 sec
The slope is:
(c) 18 sec: No slope so acceleration at 18 sec is 0 m/s²