Question

A 66 kg student traveling in a car with a constant velocity has a kinetic energy of 1. 1 104 J. What is the speedometer reading of the car in km/h?

Answer 1

65.74 km/hr

Step-by-step explanation:

KE = 1/2mv²

I'm assuming the KE is 1.1x10⁴ J ? It's hard to tell from what you wrote.

1.1x10⁴ J = 1/2(66 kg)v²

v² = 2(1.1x10⁴ J) / (66 kg) = 333.3 m²/s²

v = √333.3 m²/s² = 18.26 m/s

convert m/s to km/hr:

18.26 m/s x 1 km/1000 m x 3600 s/hr = 65.74 km/hr