Atennis ball is released from a height of 2.0 m above the floor, and then bounces three times. with each bounce, dissipative forces cause it to lose 16.0% of its mechanical energy. how high does it reach after the third bounce? 12 cm 120 cm 140 cm 120 mm

Here initial total potential energy of the ball is given by

now on each bounce it will lose 16% of the energy

so at each bounce it will have 84% of initial energy

so here we will have total energy after first collision

After 2nd collision total energy is given as

now after third collision the final energy is given by

so the final height is given as

so after third bounce its height will be 1.185 m

A permanent magnet creates a magnetic field at all points in the surrounding region.

An electric current in a conductor creates a magnetic field at all points in the surrounding region.

A moving electric charge creates a magnetic field at all points in the surrounding region.

Explanation:

Magnet field is a region around the magnet in which the magnetic force can be experienced. A magnet has two poles: North pole and South pole. A Magnetic field originates from north pole and ends at south pole.

Magnets are of two types: Permanent magnet and temporary magnet.

A moving charge produces magnetic field. A stationary charge can not produce a magnetic field.

The rate of flowing charge constitutes an electric current. If the cardboard is placed around the current carrying conductor and the iron fillings spread around the cardboard then the iron nails get stick to it. It means that a current carrying conductor creates a magnetic field around it.

Therefore, the true statements from the given statements are as follows;

A permanent magnet creates a magnetic field at all points in the surrounding region.

An electric current in a conductor creates a magnetic field at all points in the surrounding region.

A moving electric charge creates a magnetic field at all points in the surrounding region.