A rock (m= 2kg) is shot up vertically at the same time that a ball (m= 0.5kg) is projected horizontally. If both start from the

Answer:

Horizontal component of the initial velocity=v ×cos20°

horizontal displacement= 35m

time taken. (t)=35÷(v×cos20°)

vertical component of the initial velocity= v×sin20°

vertical displacement= -5m(since it is opposite to the direction of the initial velocity. )

application of s=ut+1/2at×t. vertically,

-5=vsin20°×t -1/2 gt×t

-5= vsin20×35/vcos20-1/2×10×35×35/(vcos20×vcos20)

simplify further to obtain v and hence find the time taken

The volume is given by:

V = Ad

V = volume, A = surface area, d = depth

Given values:

A = 116214700km² = 1.162147×10¹⁸cm², d = 3940m = 394000cm

Plug in and solve for V:

V = 1.162147×10¹⁸(394000)

V = 4.57885918×10²³cm³

Answer:

Rays will bounce back and stay parallel.

Explanation:

The plane mirror reflects light according to the laws of reflection.

From that you know when a light ray reflects its incident angle is equal to the reflected angle. From that we know when a set of parallel rays get reflected by the mirror, the reflected rays will make the same angle with the mirror.

So rays will stay parallel to each other.