Question

a body is projected from the ground with a velocity at an angle 30 degree it crosses a wall after 3 sec how far beyond the wall the stone will strike the ground ?​

Answer 1

Answer:

Time of flight ,T=  

g

2usinθ

​  

 

=  

10

2×50×sin30  

∘

 

​  

 

10

100×(1/2)

​  

=5s

Range, R=  

g

u  

2

sin2θ

​  

 

=  

10

2500×(  

3

​  

/2)

​  

=216.5m

$$Now we have time t=3s,

T

t

​  

=  

R

X

​  

 

5

3

​  

=  

216.5

X

​  

 

X=  

5

3

​  

×216.5=129.9m

The distance beyond the wall where the stone will hit R−X=216.5−129.9=86.6m

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