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Projectiles containing delicate electronic equipment may be damged if they are subjected to high accelerations. For this reason ,such projectiles may be fired from guns with long barrels but not from guns with short barrels.

(a) state two factos which affect the range of a projectile fired from a gun.

(b) Explain why a projectile fired from a long-barrelled gun is subject to less acceleration than a projectile fired from a short-bareeled gun if the range is the same in both cases.

(c) Draw a free-body force diagram for a projectile just after it has left the barrel of a gun.

(a) state two factos which affect the range of a projectile fired from a gun.

(b) Explain why a projectile fired from a long-barrelled gun is subject to less acceleration than a projectile fired from a short-bareeled gun if the range is the same in both cases.

(c) Draw a free-body force diagram for a projectile just after it has left the barrel of a gun.

a) Initial velocity, angle of projection

b) Acceleration = velocity/time. A longer barrel means the time to accelerate is longer, so for the same end velocity as a shorter barrel, the acceleration is lower.

c) Its a parabola, a gentle symmetric arc.

b) Acceleration = velocity/time. A longer barrel means the time to accelerate is longer, so for the same end velocity as a shorter barrel, the acceleration is lower.

c) Its a parabola, a gentle symmetric arc.

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