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Class XI


                                                       PHYSICS



                                 Ch-   Motion in a Straight Line (1DMotion)


                                              HOME ASSIGNMENTS


            1.
                A car travels the first half of a distance between two places at a speed of 30 km/hr and the
                second half of the distance at 50 km/hr. The average speed of the car for the whole journey is

                a.  42.5 km/hr.
                b.  40.0 km/hr.

                c.  38.2 km/hr.

                d.  37.5 km/hr.

            2.
                A stone is dropped from the top of the tower and travels 24.5 m in the last second of its journey.
                The height of the tower is

                a.  72 m.
                b.  49 m.

                c.  44.1 m.

                d.  32 m.
            3.                                                                        2   3
                A car moves along a straight line whose motion is given by, s = 12t + 3t - 2t  where s is in metre
                and t is in seconds. The velocity of the car at start will be

                a.  16 m/s.
                b.  12 m/s.

                c.  9 m/s.

                d.  7 m/s.
            4.
                The  velocity-time  graph  of  a  body  is  shown  in  the  figure.  It  implies  that  at  point  B



















                a.  the force is zero.
                b.  there is a force, which opposes motion.
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