**Answer:**

Gravity and magnetism are not the same thing. In fact, they are completely separate forces. Gravity is a force that acts between any two objects with mass. ... Magnetism can either pull the two objects together or push them apart, depending on which way the magnets point.

**Explanation:**

The first thing you should know for this case is that density is defined as the quotient between mass and volume:

D = M / V

In addition, you should keep in mind the following conversion:

1Kg = 1000g

Substituting the values we have:

D = (23.0 * 1000) / (2920) = 7.88 g / cm ^ 3

** answer**

** the density of the iron plate is 7.88 g / cm ^ 3**

Work done by a given force is given by

here on sled two forces will do work

**1. Applied force by Max**

**2. Frictional force due to ground**

Now by force diagram of sled we can see the angle of force and displacement

work done by Max =** **

Now similarly work done by frictional force

Now total work done on sled

The momentum goes to the wall

**Answer:**

Part a)

Part b)

Part c)

Part d)

Part e)

Part f)

Part g)

**Explanation:**

Initial speed of the launch is given as

initial speed =

angle = degree

Now the two components of the velocity

similarly we have

Part a)

Now we know that horizontal range is given as

maximum height is given as

so we have

time of flight is given as

Part b)

Now the speed of the ball in x direction is always constant

so at the peak of its path the speed of the ball is given as

Part c)

Initial vertical velocity is given as

Part d)

Initial speed is given as

so we will have

Part e)

Angle of projection is given as

Part f)

If we throw at same speed so that it reach maximum height

then the height will be given as

Part g)

For maximum range the angle should be 45 degree

so maximum range is