Question

Read the following passage carefully and answer the questions:

Mehak was moving through the city roads towards her school by a car.

Finding the road wide and free, Mehak asked her driver to drive at a

high speed of 80 km/h to get a thrill. Driver, however, said no to

overspeeding. Driver told Mehak that ‘speed thrills but kills’. Her sister

Veena was telling the hazards of speed on road. Veena was trying to

convince her by narrating incidents of hazards caused by overspeeding

vehicles. Driving at a constant speed of 50 km/h on the road, it took

exactly 30 minutes to reach her school. She recorded the odometer

reading of the car after every 5 minutes and plotted a graph for

distance versus time. She then inferred about the type of motion and

found average speed from the graph.

Answer the following question:

1. Which qualities of Mehak are worth mentioning? What measuring

device was used by Mehak?
2. What type of motion would she have inferred? What was the

distance covered by Mehak on going from her home to school?

How is average speed calculated from the graph?​

Answer 1

1. Mehak is curious, practical, skilled , alert and enthusiatic. Device used by Mehak for measuring distance was odometer.

2. Data given is insufficient to decide what kind of motion she interfers. Motion can be uniform or non-uniform.

Distance = Speed / time taken k= 50 / 0.5 = 25 km. Average speed = total time taken / total distance travelled

And total distance travelled is given by the area under the velocity v/s time graph.

Hence, Average speed = total time taken / area under the curve.

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