Question

a police man stans at 78.4 m from a building and fkres a bullet at which passes through a window 39.2 above the grounx calcukate the velocity of projection of a bullet and the amgle at which bullet was fired
​

Answer 1

Answer:

this is the solution of your que

Answer 2

According to question  

R = 2 × 78.4 m  

H = 39.2 m  

Relationship between R and H is  

H = R Tanx / 4  

Then,  

Tanx = 4H / R  

Tanx = (4 × 39.2) / (2 × 78.4)  

Tanx = 1  

x = 45°  

 

Now,  

H = u^2 Sin^2x / (2g)  

u = sqrt(2gH) / Sinx  

u = sqrt(2 × 9.8 × 39.2) / Sin45  

u = sqrt(2 × 9.8 × 39.2) / (1/sqrt(2))

u = 39.2 m/s  

Velocity of projection of ball is 39.2 m/s  

Thanks me

Rate my answers ;)

#BrainlyPrince727