Question
A bullet is fired from a gun at 30°to the Horizontal the bullet remains in flight for 25secs before touching the ground calculate the velocity of the Projection. Take g=10
Answers
Anonymous
S= speed at takeoff
Vi = initial Vertical velocity = S sin 30 = S/2
v = Vi - g t = S/2 - 9.81 t
at TOP v = 0
so S = 19.62 * t up
but t up = half the total time = 25/2 seconds = 12.5 seconds
so
S = initial SPEED = 19.62 * 12.5 = 245 meters/second
Vi = initial Vertical velocity = S sin 30 = S/2
v = Vi - g t = S/2 - 9.81 t
at TOP v = 0
so S = 19.62 * t up
but t up = half the total time = 25/2 seconds = 12.5 seconds
so
S = initial SPEED = 19.62 * 12.5 = 245 meters/second
oobleck
the upward speed
v(t) = v0 sin30° - 10t
since v=0 when t=12.5,
v0 = 250 m/s
v(t) = v0 sin30° - 10t
since v=0 when t=12.5,
v0 = 250 m/s