Question

A man can throgh a stone to maximum distance of 80m. The maximum height to which it will rise is?

Answer 1

Answer:

So, the maximum height to which it will rise is 20 m.

Explanation:

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Answer 2

Answer:

20m

Explanation:

Let the speed by which the stone is thrown be  u making an angle θ with the horizontal.

∴ Horizontal range     R=  

g

u  

2

sin2θ

​

 

For maximum horizontal range         θ=45  

o

 

⟹    R  

max

​

=  

g

u  

2

sin90  

o

 

​

=  

g

u  

2

 

​

 

80=  

10

u  

2

 

​

             ⟹u  

2

=800

Let maximum height it attains be  H

∴   H=  

2g

u  

2

sin  

2

θ

​

                 where   θ=45  

o

 

H=  

2g

u  

2

sin  

2

45  

o

 

​

=  

2×10

800×  

2

1

​

 

​

=20 m