Question

A car travels at the rate of 30km/h for 5 minutes and then at the rate of 40km/h for 10minutes .Find Displacement and Average velocity of the car

Answer 1

a car travels @ of 30 km./h.
=0.5km./m.
so, 2.5km.= 5m.

then, a car travels @ of 40km./h.
=0.67km./h.(approx.)
so, 6.67km. = 10m.

total displacement of car = 2.5km. + 6.67km.= 9.17km.



average velocity of car,

S=ViT+ 1/2 ATsq.
Vave=S/T=Vi+1/2 AT
Vave=Vi+1/2(Vf-Vi)
Vave=Vi+Vf-Vi= Vi+Vf= (Vf+Vi)/2
This is a formula to find average velocity...

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