Answer :

Height from where the projectile is fired, h = 40 m

Initial speed of the projectile, u = 50 m/s

Final speed at which the projectile hits the ground = v m/s

Acceleration due to gravity, g = 10 m/s2

Using the equation of motion, v2 - u2 = 2gh

v2 = u2 + 2gh

v2 = 502 + 2×10×40

v2 = 2500 + 800

v2 = 3300

v = 57.45 m/s

The projectile hits the ground with a speed of 57.45 m/s

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