Question

a firework shell is acclerated from rest to a velocity of 50m/s over a distance of 0.25m. calculate the acclerartion . how long will it take?

Answer 1

Initial velocity u = 0 m/s
Final velocity v = 50m/s
Distance s = 0.25 m
v2-u2=2as
50^ 2. - 0^2 = 2 a x 0.25
2500 = 0.5a
a = 2500/0.5
= 5000m/s^2
Now
v = u+at
50 = 0 + 5000 x t
t = 50/5000
t = 0.01 s
Thus it will take 0.01 sec