KILOGRAMS!!!!!!!!!!!!!!!!!
Answer:
a.The 60 km/HR car
Explanation:
Kinetic Energy: This can be defined as the energy of a body due to motion. The S.I unit of kinetic energy is Joules (J).
It can be expressed mathematically as
Ek = 1/2mv²......................... Equation 1
Where Ek = kinetic energy, m = mass, v = velocity.
(i) A car travelling at 30 km/hr, with a mass of m,
Ek = 1/2(m)(30)²
Ek = 450m J.
(ii) A car travelling at 60 km/hr, with a mass of m/2
Ek = 1/2(m/2)(60)²
Ek = 900m J.
Thus , the car travelling at 60 km/hr at half mass has a greater kinetic energy to the car traveling at 30 km/hr at full mass.
The right option is a.The 60 km/HR car
D, because the hairdryer uses a fan
E, because it produces heat
The answer is the Milky Way .
Explanation:
Work = change in energy
W = ΔKE
W = ½ m (v² − v₀²)
W = ½ (1750 kg) ((27 m/s)² − (15 m/s)²)
W = 441,000 J
W = 441 kJ