10-12-2021
Physics

contestada

A ball rolling down a hill with a speed of 8 m/s has 139 J of kinetic energy. What is it's mass in kg?

Respuesta :

KimYurii KimYurii

10-12-2021

Explanation:

Velocity of ball (v) = 8 m/s
Kinetic Energy (K.E) = 139 J
Mass (m) = ?

We know that,

• K.E = ½mv²

→ 139 = ½ × m × (8)²

→ 139 = ½ × m × 64

→ 139 = 1 × m × 32

→ 139 ÷ 32 = m

→ 4.34 kg = m

Therefore, mass in kg is 4.34 kg.

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