Mechanics | Relativity Answers

Stone A is thrown vertically upwards with a speed of 10 meters per second from the edge of the roof of a 40m high building.Ignore the effects of friction.Take the ground as reference.
First we had to calculate maximum height then,please help me with these questions?with detailed explanation of every step please?And equations and calculations please?
1)Write down the magnitude and direction of the acceleration of stone A at this maximum height.
2Now Stone B is dropped from rest from the edge of roof x seconds after stone A was thrown upwards.Stone A passes stone B when the two stones are 29,74m above the ground.Calculate the value of x.

I don’t understand what momentum,impulse and conservation of mechanical energy.May you please explain it in the simplest terms with an easy example please?Thanks

In a work energy thereom question,they can say calculate the distance up the ramp while only giving us the frictional force and the velocities .I saw the solution,to find the distance they use the formula Wnet=Ek But then Wnet should also consist of applied force,gravitational force parallel and frictional force.In this case they only used the frictional force as it was the only information given and left out applied force.Does this mean that we must keep a sum simple and not try to find out applied force if its not given?and only work with information that is given?So under Wnet,there is only friction,is that possible?

In vertical projectile motion,when the displacement is negative answer,does it mean it is below the point of reference?Why do sometimes final velocity also have a negative sign in front?Another question is in work energy theorem I also saw sometimes For Wnet calculations,let’s say friction of 1000 Ń was given,then they only put 1000N under Wnet,what about applied force and parallel force of gravity?does it mean if they don’t give us other information.we can just keep it simple and say Friction force is the only force under Wnet?

Suppose that you and your friend are inertial observers (that is, that both
reference frames are inertial). Suppose that two events, A and B, are
simultaneous in your own reference frame. Draw two spacetime diagrams
in your reference frame. Include your friend’s worldline in both. For the
first, arrange the relative velocity of you and your friend so that event A
occurs before event B in your friend’s reference frame. For the second,
arrange it so that event B occurs first in your friend’s frame. In both
cases, include one of your friend’s lines of simultaneity on the diagram.

2.A car travels around a bend of radius 400m on a road which is banked at an angle to the horizontal, if the car has no tendency to slip when travelling at 35m/s. Find the angle

1. A particle of mass 300g is attached to one end of a light inextensible string of length of 400m, the other end of the string being fixed at o on a smooth horizontal surface. If the particle describe a circle centre o, find the tension in the string a.the speed of the particle is m/s b.the angular speed of the particle is 5rad/s

A car slows down from 20m/s with a uniform velocity retardation of 25m/s2 calculate how long it will take the car to reach 5m/s and the distance that will be covered .

a sphere of radius r moving with a velocity v under streamline conditions in a viscous fluid experiences a retarding force, F, given by F = Krv where K is constant. Derive the S.I units of K in terms of the base units.

The force required to stretch a Hooke’s-law
spring varies from 0 N to 42.5 N as we stretch
the spring by moving one end 7.23 cm from
its unstressed position.
Find the force constant of the spring.
Answer in units of N/m.
Don't round answer