Question

What is the kinetic energy of a body of mass 30kg moving with a velocity of 5m/s.
2. If a car of mass 6000g is travelling with a velocity of 40m/s, calculate its kinetic energy.
3. What is the mass of a body with K.E of 800J, moving with the velocity of 10m/s

Answer 1

Answer:

375J,4800J,16Kg

Explanation:

m=30Kg

v=5m/s

=1/2×30×25

=375J

2. m=6Kg

v=40m/s

1/2×6×1600

=4800J

3. K.E=800J

v=10m/s

800=1/2m×100

=16Kg

Answer 2

Answer:

Explanation:

KINETIC ENERGY = 1/2 MV²

(1) MASS, M = 30 KG

   VELOCITY , V= 5 M/S.

  KINETIC ENERGY= 1/2*30*5*5

                             = 15*5*5

                             = 375 JOULES.

(2) MASS, M = 6000G

                     = 6000*10⁻³ KG

                     = 6 KG

    VELOCITY = 40 M/S

    KINETIC ENERGY = 1/2*6*40*40

                              = 3*40*40

                              = 4,800 JOULES.

(3) MASS, M = ?

     VELOCITY , V = 10 M/S

     KINETIC ENERGY = 800

     800= 1/2*M*10*10

     800=1/2*M*100

     M = 8*2

     M = 16 KG.

HOPE THIS HELPS.