2 years ago

Q 2 Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30°

1 answer:

3 0

a ray of light is incident towards a plane mirror at an angles of 30degrees with the mirror surface. what will be the angles of reflection is 60degree.

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3 years ago

If an object is projected upward from ground level with an initial velocity of 160 ft per sec, then its height in feet after t

sesenic [268]

Answer:

Time will be 5 sec

And maximum height will be 1200 feet

Explanation:

We have given that initial velocity of the object u = 160 ft/sec'

Function of height $s(t)=-16t^2+160t$

Take derivative of the distance

We know that first derivative of distance is velocity

So $v(t)=-32t+160$

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So $-32t+160=0$

t = 5 sec

So it will take 5 sec to reach maximum height

Now maximum height will occur at t = 5 sec

So maximum height = $16\times 5^2+160\times 5=1200feet$

7 0

2 years ago