Q22 of 53 Page 228

Manoj was travelling by Metro train while Rajnish was travelling by his car towards the same destination. Manoj was surprised to reach much before Rajnish and said, since his motion was uniform, he could reach on time. However, Rajnish said that Manoj’s motion was also not uniform.

(i) Who gave a correct explanation of types of motion?


(ii) How did Manoj reach early?


(iii) Give the characteristic values of Manoj.

(i) Rajnish gave the correct explanation as for a uniform motion the velocity should be uniform. But the metro has stopped at various stations which means that it had come to rest and its velocity at that point is zero.

(ii) Manoj had used metro which is free from the traffic jam and thus manages to reach early.


(iii) Manoj is a responsible citizen as he had used a public transport instead of the personal car which helps in conservation of fuel.


More from this chapter

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20

Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th second.

 21

Manan and Sharman went to Agra through Yamuna-Expressway. Manan started the car and accelerated, so highly that the car was running at 180 km/h within the 20s. Sharma stopped him from doing so and told him that over speeding on road was a straight invitation to life staking situation. Though Manan wanted the adventure of speeding but he was convinced by Sharman.

(i) Why do you think it is dangerous to drive fast on road?


(ii) Which values of Sharman are worth appreciating?


(iii) Find Manan’s speed in m/s.


(iv) What is the acceleration of car?


(v) What would you suggest to Manan, if you were in that car?

 23

Neha and Priya went to market. There was no parking space left. Neha parked the car on road side and came out. Priya, however, was very concerned about traffic rules and said that the car should not be standing in ‘Tow Away Zone’. She made Neha drive to the next parking slot which was a little for from the market area.

(i) Compare and contrast the values of Neha and Priya.


(ii) What type of motion is exhibited by a car moving in the market area?


(iii) Represent a car parked in a parking area graphically on a distance-time graph.

 1

A 100 m sprinter increases her speed from rest uniformly at the rate of 1 m/s2 upto 40 m and covers the remaining distance with a uniform speed. The sprinter covers the first half of the run in t1s and second half in t2s, then