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CBSE Class 12-science Answered

a car travels first 10 seconds with uniform acceleration of 2 metre per second square from rest on a straight road and then travels with zero acceleration for next 10 seconds.the average speed of entire journey is
Asked by ritukkr4444 | 07 Jul, 2019, 02:07: PM
answered-by-expert Expert Answer
Distance travelled with uniform acceleration = (1/2)×a×t2 = (1/2)×2×10×10 = 100 m
 
speed after 10 seconds = a×t  = 2×10 = 20 m/s
 
distance travelled with uniform speed = 20×10 = 200 m
 
average speed = (total distance)/ time = (200+100)/20 = 15 m/s
Answered by Thiyagarajan K | 07 Jul, 2019, 04:20: PM

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