33 Years NEET-AIPMT Chapterwise Solutions - Physics 2020

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Motion in a Straight LineTelegram @unacademyplusdiscounts9CHAPTER3Motion in aStraight Line3.3 Average Velocity and Average Speed1. A particle covers half of its total distance with speedv 1 and the rest half distance with speed v 2 . Its averagespeed during the complete journey isv v(a) 1+2vv(b)1 22v1+v22vv(c) 1 2vv(d)1 2 2 2v1+v2v1 2 + v2 2 (Mains 2011)2. A car moves from X to Y with a uniform speedv u and returns to X with a uniform speed v d . Theaverage speed for this round trip isvdvu(a) vuvd(b)v + vd u2vdvuvd+ vu(c)vu+ vd2(d)(2007)3. A car runs at a constant speed on a circular track ofradius 100 m, taking 62.8 seconds for every circularlap. The average velocity and average speed for eachcircular lap respectively is(a) 10 m/s, 0 (b) 0, 0(c) 0, 10 m/s (d) 10 m/s, 10 m/s. (2006)4. A car moves a distance of 200 m. It covers the first halfof the distance at speed 40 km/h and the second halfof distance at speed v. The average speed is 48 km/h.The value of v is(a) 56 km/h (b) 60 km/h(c) 50 km/h (d) 48 km/h. (1991)5. A bus travelling the first one-third distance at a speedof 10 km/h, the next one-third at 20 km/h and at lastone-third at 60 km/h. The average speed of the bus is(a) 9 km/h (b) 16 km/h(c) 18 km/h (d) 48 km/h. (1991)6. A car covers the first half of the distance betweentwo places at 40 km/h and another half at 60 km/h.The average speed of the car is(a) 40 km/h (b) 48 km/h(c) 50 km/h (d) 60 km/h. (1990)3.4 Instantaneous Velocity and Speed7. Two cars P and Q start from a point at the same timein a straight line and their positions are representedby x P (t) = (at + bt 2 ) and x Q (t) = ( ft – t 2 ). At what timedo the cars have the same velocity?a−fa+f(a)(b)1 + b2( b −1)a+ff − a(c)(d)21+ ( b)21+ ( b) (NEET-II 2016)8. If the velocity of a particle is v = At + Bt 2 , where Aand B are constants, then the distance travelled by itbetween 1 s and 2 s is3 7A B(a) A+ B (b) +2 32 33(c) A+ 4B(d) 3A + 7B (NEET-I 2016)29. The displacement ‘x’ (in meter) of a particle ofmass ‘m’ (in kg) moving in one dimension underthe action of a force, is related to time ‘t’ (in sec) byt = x +3. The displacement of the particle when itsvelocity is zero, will be(a) 4 m(b) 0 m (zero)(c) 6 m(d) 2 m(Karnataka NEET 2013)10. A particle showsdistance-time curve asgiven in this figure. Themaximum instantaneousvelocity of the particle isaround the point(a) D(b) A(c) B (d) C (2008)
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33 Years NEET-AIPMT Chapterwise Solutions - Physics 2020

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