40 - io 20 30 so sot time Figure represent speed (km/h) time min) graph for an objed . Find the distance covered by the object. to t= 50min (a) between t= 20 min (b) between t min do 60 min (0) what is the speed of the object
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Speed of car for first 30 minutes = 30 km h^{-1}h
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Speed of car for next 1 hour = 40 km h^{-1}h
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(a) total distance travelled by the car
First case
Speed = distance / time
distance = speed x time
= 30 x 0.5 ---- (30 min = 0.5 hour)
= 15 km ---- (i)
Second case
speed = 40 km h^{-1}h
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distance = 40 km x 1
= 40 km ---- (ii)
Adding (i) and (ii)
Total distance = 15 km + 40 km
= 55 km
(b) total time of travel = 0.5 hr + 1.0 hr = 1.5 hr
(c) average speed = total distance travelled/total time taken
= 5.5 km/ 1.5 hr
= 36.67 km h^{-1}h
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