A firework rocket of mass is set off from the ground
PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
A firework rocket of mass 50g is set off from the ground. It travels vertically upwards until it explodes in a shower of brightly coloured sparkles. Use g=10m s−2.
(a) Outline the energy transformations taking place as the rocket sets off and moves vertically upwards.
(b) When the rocket explodes at the top of its trajectory, what energy transformation(s) occur?
(c) If the rocket reaches 150m above the ground when it explodes:
(i) What is the minimum amount of chemical energy the rocket stored before it was set off?
(ii) Why is your answer to part (i) a minimum?