Question

For uniform motion,write the relation among v,s,t.Acar travells at a speed of 120 km/ hr during the first half of its running time and at 40 km/hr the other half.Find the average speed

Answer 1

Avg speed= $\frac{total \: distance }{total \: time}$
v= 120 ×t+ 40×t/ 2t
v avg= 80 km/ hr