Question

a footballer kicks a ball at angle of 45 ∘ with horizontal if the ball was in the air for 10second and land 4000 metre away determine it's initial speed ​

Answer 1

Answer:

200 m/s

Explanation:

Angle of Projection = 45°

Horiontal distance covered by Ball(R) = 4000 m

Time in air = 10 s

R = u² sin 2θ /g where u = Initial Speed, g = Speed of gravity = 10

4000 = u² sin 90 / 10

∴ u² = 40000

∴ u = 200 m/s