A car moving in a straight line at a speed of 120 km covers in 2 hours. There after from that
left side it covers 50 km in 1 hour. At that moment its average speed and average velocity will
...... and ......
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Motion in a Straight Line
Speed and
A car travels at a speed of 80 km/h during the first half of its running time and at 40 km/h during the other half , then the average speed of the car.......
A
50 km/hr
B
75 km/hr
C
60 km/hr
D
40 km/h
ANSWER
Let the each half of the running time be t.
During first half time, speed of car is 80 km/h
Distance covered d1=80t km
During second half time, speed of car is 40 km/h
Distance covered d2=40t km
Total distance covered d=d1+d2=80t+40t=120t
Total time taken T=2t
Average speed vavg=Td=2t120t=60 km/hr
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