Aball is thrown vertically upwards at 19.6 m/s. for its complete trip (up and back down to the starting position), its average velocity is

Step by Step Solution :

Given :

A ball is thrown vertically upwards at 19.6 m/s.

Calculation :

We know that,

Now,

t = 2 sec

Therefore, total trip of 4 seconds (2 sec up and 2 sec down)

We also know that, displacement

Therefore total height = 2s

Total height = 39.2 m

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.