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A particle moving in a straight line covers half the distance with speed of 3 m/s.The other half of the distance is covered in two equal time intervals and with speeds of 4.5 m/s and 7.5 m/s,respectively. The average speed of particle during this motion is
Options
(a) 4 m/s
(b) 5 m/s
(c) 5.5 m/s
(d) 4.8 m/s
Correct Answer:
4 m/s
Explanation:
Average Speed for second half= 4.5+7.5/2 =6 m/s
If particle travels in two equal time interval, Average Speed = 2v1*v2 / (v1+v2)
here v1=3 m/s and v2=6 m/s, so
Average Speed= 2*v1*v2/v1+v2 = 2*3*6 / (6+3) =36/9=4.0 m/s
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Topics: Motion in Straight Line
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The current in a conductor varies with time t as I=2t+3t² Where I is in amperes
- A 5 watt source emits monochromatic light of wavelength 5000Å. When placed
- A satellite in a circular orbit of radius R has a period of 4 hours. Another satellite
- The half-life period of a radio-active element X is same as the mean life time
- A body moves with a uniform acceleration a and zero initial velocity
Topics: Motion in Straight Line (93)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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