A mortar-style fireworks shell must be detonated at height of 100m. You want this to be at the top of its trajectory (highest point just before starting to fall). (a) What should the firework's launch speed be? [44.3 m/s] (b) For how many seconds does the detonation fuse burn if it was lit at the instant of launch? [4.5 s] (c) Bonus: If you want to double the height of the firework, how many times bigger would you need the launch speed to be?