**Answer:**

**6.32s**

**Explanation:**

Given parameters:

Length of track and distance covered = 200m

Acceleration = 10m/s²

Unknown:

Time taken to cover the track = ?

Solution:

To solve this problem, we apply one of the motion equations as shown below:

S = ut + at²

S is the distance covered

t is the time taken

a the acceleration

u is the initial velocity

The initial velocity of Superman is 0;

So;

S = at²

200 = x 10 x t²

200 = 5t²

t² = 40

t = **6.32s**

**Answer**

When a body moves in projectile motion it has two components. One of the components is a horizontal component of the velocity and another is a vertical component.

The velocity along the horizontal component does not change because **there is no acceleration long horizontal component. **

Whereas velocity along vertical direction keeps on changing because t**he acceleration due to gravity is acting on the object**. At a maximum height of the projectile velocity is equal to zero.

**Answer:**

Rubber or plastic covers are bad conductors of electricity. So they do not allow the electric current to pass through it.

**Explanation:**

Rubber and plastic are bad conductors of electricity, therefore when handling a tool with a rubber handle, the electricity will not pass through it.

**Answer**

given,

wavelength (λ)= 500 n m

thickness of film= 10⁻⁴ cm

refractive index = μ = 1.375

distance traveled is double which is equal to 2 x 10⁻⁴ cm

a) Number of wave

N = 2.91

**N = 3 **

b) phase difference is equal to

Reflection from the first surface has a 180° (½λ) phase change.

There is no phase change for the 2nd surface reflection and there is no phase difference for the 2nd wave having traveled an exact whole number of waves.

net phase difference =

=** 270°**

A) True there able to target the people they post the assignment on.

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