Mechanics> A ball is thrown horizontally from a clif...

A ball is thrown horizontally from a cliff such that it strikes the ground after 5 seconds. The line of sight from the point of projection to the point of projection of hitting makes an angle of 37 degrees with the horizontal. What is the initial velocity of projection?

ADITI , 8 Years ago

Grade 11

1 Answers

Arun

Dear Aditi

When you make the diagram you will see

Tan 37 = h/R

3/4 = h/R

R = 4 h/3

Also

T = $\LARGE \sqrt$ (2h/g)

5 = $\LARGE \sqrt$ (2h/g)

25 = 2h/g

Put g = 10

h = 125 metres

Now

R = u*T

u = R/T = 4*125/3*5

u = 100/3 m/sec

Regards

Arun (askIITians forum expert)

Last Activity: 8 Years ago

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Mechanics> A ball is thrown horizontally from a clif...

A ball is thrown horizontally from a cliff such that it strikes the ground after 5 seconds. The line of sight from the point of projection to the point of projection of hitting makes an angle of 37 degrees with the horizontal. What is the initial velocity of projection?

ADITI , 8 Years ago

Arun

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