How far will Lois have fallen when she is caught?Walter White said:
It has to be the difference between the 2 heights. 13.2 - 6.8.haruspex said:
So what is Lois' velocity when they meet?Walter White said:
When you say you need time, do you mean you think you need to know how much time elapsed, or merely that you cannot work it out immediately?Walter White said:
Like I need the time to figure out the velocity from the formula d/tharuspex said:
Yes how much time was elapsed because there's no mention of time in the problemharuspex said:
For motion under constant acceleration, there are five standard variables (usually known as SUVAT, s for displacement, u for initial speed, v for final speed, a for acceleration, t for time). There are correspondingly five equations. Each equation omits one of the five variables. Are you familiar with these?Walter White said:
Right. I suggest you Google SUVAT. Plenty of references. Or, in this case, you can use work conservation.Walter White said:
Stick with vertical motion for now. You know the vertical speed of each just before they meet. Can you find their vertical speed just afterwards?Walter White said:
Please post your working.Walter White said:
First I found Louiss velocity using this formula in the above imageWalter White said:
I cannot follow what you did there, not only because it was upside down and hard to read. (The posting of images is intended for diagrams and textbook extracts. Please take the trouble to type in your working. This makes it both easier to read and easier to make specific comments on.)Walter White said:
No, Superman's initial velocity is what you have to find. I see no 9.8m/s in the question statement.Walter White said:
Momentum is a measure of an object's motion and is defined as the product of its mass and velocity. In 2d physics, momentum has both magnitude and direction, and is a vector quantity.
In 2d collisions, momentum is conserved when the total momentum of the system before the collision is equal to the total momentum after the collision. This means that the sum of the individual momentums in the x and y directions must be the same before and after the collision.
In elastic collisions, both momentum and kinetic energy are conserved, meaning that the objects involved bounce off each other without any loss of energy. In inelastic collisions, only momentum is conserved and some kinetic energy is lost, resulting in the objects sticking together after the collision.
The momentum of an object in 2d space can be calculated by multiplying its mass by its velocity in both the x and y directions. The resulting values can then be added together to find the total momentum.
Yes, momentum can be negative in 2d physics. This usually occurs when an object moves in the opposite direction of the chosen coordinate system, resulting in a negative value for its momentum in that direction.
