A person walks along an east-west street and a graph of his displacement from home is shown in figure. His average velocity for the whole time interval is:-

Answer

(i) `160 km//hr^(2)` (ii) 10 km

Explanation

From given situation :
(i) `a_(avg)=(60-20)/(1.00-0.75)=4000/25=160 km//hr^(2)`
(ii) Area `=1/2xx[20+60]xx0.25`
`=40xx25/100=10 km`