Question

fire services with a speed of 84 metre per second when the Canon is inclined at 45° the horizontal distance covered is 640 what is the percentage decrease in the horizontal distance of your due to air resistance​

Answer 1

Answer:

The range projectile in the absence of air resistance, R=

g

u

2

sin2θ

Horizontal speed =ucosθ

Time of flight =

g

2usinθ

therefore

R=

9.8

84

2

sin(2×45

∘

)

=720m

Actual range observed =630m

Percentage decrease =

720

720−630

×100=12.5%