Question

Hi friends ,

Q-1 } A ball of mass 200 g falls from a height of 5 metres .What is it's kinetic energy when it just reaches the ground ?(g=9.8 m/s ^2 )

Q-2} What is the difference between potential energy and kinetic energy??

PLEASE GIVE CORRECT ANS...

Answer 1

Q. 1

mass=200g=200/1000=0.2kg

height=5m

acceleration due to gravity=9.8m/s²

kinetic energy=mass × acceleration due to gravity×height

=0.2×9.8×5

=9.8 Joule

Q. 2

kinetic energy

1. The energy possessed by a body due to its motion is called its kinetic energy

2. It occurs only in one form and for doing work it does not have to be transformed into another form

Potential energy

1. The energy possessed by a body on account of its specific state or position is called its potential energy

2. It occurs in various forms such as gravitational potential energy and electric potential energy but work is not done till it is transformed into kinetic energy

Answer 2

Hey!

1. mass = 200g = 0.2 kg
    height = 5 m
    gravity = 9.8 m/s^2
  
Now,
P.E = mgh
       = 0.2 x 5 x 9.8
       = 9.8 J
We know,
P.E (highest point) = K.E (Lowest point or when it hit ground)
So, K.E = 9.8 J

2.
♦ P.E = Potential Energy is possessed by a body due to its position and configuration.

♦ P.E = mgh
where,
m = mass
g = gravity due to acceleration
h = height 

♦ P.E depends upon mass,height of the body raised and gravity due to acceleration.

♦ K.E = Kinetic Energy is possessed by a body due to its motion.

♦ K.E = 1/2 mv^2
where,
m = mass
v = velocity

♦ K.E depends upon the mass of the body and velocity.

Hope It Helps You!