mass of 40 kg joins him as a passenger – Discussion Forum

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Kriti

Asked: September 14, 2026In: Class 9 Science

A man of mass 60 kg rides a scooter of mass 100 kg. He accelerates the scooter to a velocity v. The next day, his son with a mass of 40 kg joins him as a passenger. If the scooter reaches the same speed on both days in the same time interval, what is the ratio of the fuel of the tank used on the two days? Assume that the energy transfer to the scooter happens entirely due to fuel, and no other losses occur due to air resistance and friction.

Fuel consumed is proportional to kinetic energy gained. The first day total mass is 160 kg, and the second day total mass is 200 kg. The required ratio of fuel used is 160 to 200, which simplifies to 4 is ...