Question

3.
Find the kinetic energy of a ball of mass 780 g moving with a velocity of 5 m/s.
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Answer 1

Answer:

9.750

Explanation:

1/2mv^2 =kinetic energy

Covert mass into kg =0.78kg

Substitute the values you'll get

Answer 2

Answer:

975*10⁻² J

Explanation:

Kinetic energy = 1/2*m*v²

mass of the ball = 780g = 780*10⁻³ kg

the velocity of the ball = 5 m/s

∴ K.E = 1/2*780*10⁻³*5²

         = 390*25*10⁻³ = 39*25*10⁻² = 975*10⁻² J