Whenever light goes from transparent to another medium or from rarer to denser medium or vice versa, it's speed changes and hence light bends.
The tension in the string and the acceleration must be equal for both masses. (See the free body diagrams)
Answer:
An object moves at a constant speed of 6m/s. this means that the object moves 6 meters every second
Explanation:
To solve this problem we will apply the concepts related to the conservation of the Momentum. For this purpose we will define the momentum as the product between mass and velocity, and by conservation the initial momentum will be equal to the final momentum. Mathematically this is,

Here,
= Mass of Dan and Skateboard respectively
= Initial velocity of Dan and Skateboard respectively
= Final velocity of Dan and Skateboard respectively
Our values are:
Dan's mass

Mass of the skateboard

Both have the same initial velocity, then

Final velocity of Skateboard is

Rearranging to find the final velocity of Dan we have then,



Replacing,


Therefore Dan will touch the ground at a speed of 3.76m/s
Answer:
answer is B! if it adds one it becomes platinum and if it loses one it becomes mercury.