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4 years ago

A concave mirror has a focal length of 0.20 m. If an object produces a virtual image

1 answer:

5 0

As per the given question,
Focal length of the concave mirror(f)=0.25m
position of virtual image form the mirror (v)=0.04m
let the position of the object from the concave mirror (u)=?
u=3.44cm

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3 years ago

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Elements in a period have wide range of chemical properties.

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3 years ago

What is a phenomenon in your own words?

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3 years ago

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Show that the speed with which a projectile leaves the ground is equal to its speed just before it strikes the ground at the end

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Answer:

Thus, the velocity at the time of strike is same as the velocity at the time of projection.

Explanation:

Let a projectile is projected vertically upwards with a speed of u and reaches to the maximum height H.

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Use the third equation of motion

$v^2 = u^2 + 2 g h \\\\0 = u^2 - 2 g H\\\\\u =\sqrt{2gH}$

Now let the velocity at the time of strike is v'.

Use third equation of motion, here initial velocity is zero.

$v'^2 = 0 + 2 g H \\\\v = \sqrt{2gH}$

Thus, the velocity at the time of strike is same as the velocity at the time of projection.

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3 years ago