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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
- A sound absorber attenuates the sound level by 20 dB. The intensity decreases
- Transformer is used to
- The physical quantity which does not have the same dimensions as the other three is
- If voltage across a bulb rated 220 volt-100 Watt drops by 2.5% of its rated value
- A potentiometer wire of length 10 m and resistance 10 Ω per metre is connected in series
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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