A bullet is fired horizontally from a 20m tall building. How long does it take to hit the ground

t = 2.02 secs

Explanation:

Given the following data;

Height = 20m

We know that acceleration due to gravity, g = 9.8m/s²

To find the time, we would use the formula for maximum height;

H = ½gt²

Substituting into the equation, we have;

20 = ½*9.8t²

20 = 4.9t²

t² = 20/4.9

t² = 4.082

Taking the square root of both sides, we have;

t = 2.02 secs

Therefore, it would take the bullet 2.02 seconds to hit the ground.

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force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2