# A 200g ball is rolling on a horizontal table, a constant speed of 5cm / m. Find Kinetic Energy and mg.

July 24, 2021 | education

| m = 200 g = 0.2 kg.

V = 5 cm / m = 0.00083 m / s.

g = 9.8 m / s2.

Ek -?

Fт -?

The kinetic energy of the body Ek is determined by the formula: Ek = m * V2 / 2, where m is the mass of the body, V is the speed of movement of the body.

We will convert the speed of the ball V into the units of the International SI system: V = 5 cm / m = 0.05 m / 60 s = 0.00083 m / s.

Ek = 0.2 kg * (0.00083 m / s) 2/2 = 6889 * 10-11 J.

The force of gravity Ft is determined by the formula: Ft = m * g, where g is the acceleration of gravity.

Ft = 0.2 kg * 9.8 m / s2 = 1.96 N.

Answer: the body has kinetic energy Ek = 6889 * 10-11 J, gravity Ft = 1.96 N. acts on it.

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