A toy rocket of mass 0.1 kg hass a small fuel of mass 0.02 kg, which it burns
Channel: Doubtnut
Date: 2020-07-26

A toy rocket of mass 0.1 kg hass a small fuel of mass 0.02 kg, which it burns out in 3s. Starting from rest on a horizontal smooth track, it gets a speed of `20ms^(-1)`  after the fuel is burnt out. What is the approcimate thrust of the rocket ? What is the energy content per unit mass  of the fuel ? (Ignore the small mass variation of teh rocket during fuel burning).