They cannot display exact materials and features would be correct!!!
Here it is the use of vector and conservation of momentum !
so,
√(16^2+21^2) ×1000= 3000 v
v =8.8 m/s
so answer is B !
if you have any doubt, you can ask ! just comment !
Answer:
It is easy to imagine representing a narrow beam of light by a collection of parallel arrows—a bundle of rays. As the beam of light moves from one medium to another, reflects off surfaces, disperses, or comes to a focus, the bundle of rays traces the beam's progress in a simple geometrical manner.
I hope it's helpful!
Answer:
C.) T = 1.20s
Explanation:
From equation of motion,
S = ut + ½gt²
S = 7m
g = 9.8m/s²
U = 0m/s (since he starts from rest)
t = ?
S = ut + ½gt²
7 = 0 * t + ½ * 9.8 * t²
7 = 0 + 4.9t²
t² = 7 / 4.9
t² = 1.42857
t = √(1.42857)
t = 1.195s
t = 1.20s