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  • The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle ? The mass of the three

Q5.8 The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.

Answers (1)

best_answer

Total mass of the system = 400 + 65 = 425 kg

Using first law of motion, we get

                                  v\ =\ u\ +\ at

Since the car comes to rest, thus final velocity will be zero.

                                  0\ =\ 10\ +\ a(4)

or                              

                             a\ =\ \frac{-10}{4}\ =\ -2.5\ m/s^2

So the force required :

                                            F\ =\ ma

or                                                =\ 465\times (-2.5)

or                                         F\ =\ -1162.5\ N

So the magnitude of the force is 1162.5 N and it is retarding force.    

Posted by

Devendra Khairwa

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