A firework rocket of mass 50 g is set off from the ground. It travels vertically upwards until it explodes in a shower of brightly coloured sparkles. (Use g=10 ms−2 .)
a. a Outline the energy transformations taking place as the rocket sets off and moves vertically upwards.
b. b When the rocket explodes at the top of its trajectory, what energy transformation(s) occur?
c. c If the rocket reaches 150 m 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?