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# 1.after 45 laps each of 10km. at an average speed of 130.7km/ha speedway racer believes that he has beaten the track record of 126.3km/h and hence he can relax for the next five laps at an average speed of 105km/h. is this correct? what would be his final average speed for 50 laps. 2.a car is travelling with a velocity of +30m/s along a straight road when its engine is switched off . for the next 10s,the car slows down and its average acceleration is -a1, for the next 5s,the car slows down further and its average acceleration is -a2.the velocity of the car at the end of 15s duration is +20m/sthe ratio of average acceleration a1/a2 is 1.5.find the velocity of car at the end of 10s interval.

Bevkoof Singh
43 Points
8 years ago

2(--i think it should be

28.9 m/s