Manan and Sharman went to Agra through Yamuna-Expressway. Manan started the car and accelerated, so highly that the car was running at km/h

Question

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?

Answer 1

(i) Over speeding on roads increases the chances of accidents which could be fatal also. Some serious injuries may happen due to this. Also they could hit some other car on the road as well.

(ii) Sharman behaved as a responsible citizen and patiently he convinced his friend not to drive like this. He is smart, intelligent, responsible as well as patient. 

(iii) Speed = 180 km/h 

1 km = 1000 m and 1 hour = 3600 secs 

speed =\(\frac{180\,\times\,1000}{3600} \) =\(\frac{18000}{3600}\) = 5 m/s

(iv) The first equation of motion: v = u + at 

where: v = final velocity = 5 m/s 

u = initial velocity = 0 m/s 

a = acceleration = ? m/s² 

t = time = 20s 

v = u + at 

5 = 0 + a × 20 

a =\(\frac{5}{20}\) = 0.25 m/s² 

(v) I would also suggest him to drive in the speed limit and try to make him realize the importance of life.