# Physics

An aircraft is fired vertically upwards with a muzzle velocity of 100m/s calculate :
A)the maximum height it can attain
B)the time taken to reach this height

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1. It must be exciting to be aboard that aircraft, almost like a projectile

Easy way - use conservation of energy

(1/2)m v^2 = m g h

h = v^2/2g

and for time:
v = 100 - 9.81 t
at top v = 0
t = 100/9.81 or about ten seconds

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