A man walks along the east-west street, and a graph of his displacement from home is shown in figure. Find his average velocity for the whole time interval shown as well as his instantaneous velocity at points A, B and C.

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`