Question

kinetic energy of an object of mass 2kg moving with a speed of 3m/s and the potential energy of an object of mass 500g at a height of 20m are respectively (acceleration due to gravity is 10m/s^2)


Urgently

Answer 1

Answer:

Answer:

K.E. = 9 J

P.E. = 100 J

Explanation:

Given :

Mass m = 2 kg

Velocity v = 3 m / sec

Now kinetic energy is given as :

= > K.E. = 1 / 2 m v²

= > K.E. = 1 / 2 × 2 × 3² J

= > K.E. = 9 J

Now :

Mass m' =500 g = 0.5 kg

Height h = 20 m

Acceleration due to gravity g = 10 m / sec²

We know potential energy is given as :

= > P.E. = m g h

= > P.E. = 0.5 × 10 × 20 J

= > P.E. = 100 J

Hence we get required answer!

Answer 2

Explanation:

Kinetic energy=1/2mv²

here,mass(m)=2kg and velocity (v)=3m/s

So,Kinetic energy=1/2x2x(3)²kgm²/s²

=9kgm²/s²

=9 joule

Now, potential energy=mgh

here,m=500g(0.5kg),

g=10m/s²

and h=20m

So, potential energy=0.5x10x20kgm²/s2

=100 joule

hope it helps.....