Question
A car has a mass of 8000 kg and a kinetic energy of 24 ,000 J.What is its speed? A. 3m/s B 2.4m/s c 1.7m/s D. 6m/s
Answer
4.3
(299 Votes)
Isaiah
Elite · Tutor for 8 years
Answer
To find the speed of the car, we need to use the formula for kinetic energy, which is defined as the energy that a body possesses due to its motion. The formula for kinetic energy (KE) is
, where
is the mass and
is the velocity of the body.In this problem, we know that the kinetic energy (KE) is 24,000 J and the mass (m) is 8000 kg. We need to find the velocity (v).We can rearrange the kinetic energy formula to solve for velocity:
Substituting the given values into the equation, we get:
Solving this gives us
m/s.So, the speed of the car is 3 m/s.Therefore, the correct answer is:【Answer】: A.
m/s.