Every time you cut your speed in half, you reduce your Kinetic energy by how many times?

6 Answers

• K1= 1/2 m v ^2

  K2 = 1/2 m (1/2 v) ^2 = 1/8 m v ^2

  K1 = 4 K 2

  b. 4 times

• 4 times

• Kinetic energy is the energy that a body possesses as a result of its movement. It is defined as the work needed to accelerate a body from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. If speed decrease by 2 energy decreases by 2*2 = 4 if speed decreases 3 times energy will decrease 3*3= 9

• Kinetic energy = 1/2 m * v^2

  let v=1 and let m = 1

  m remains constant

  1/2 * 1 * 1^2= 1/2

  now let v2 = 1/2 v1

  1/2 * 1 * (1/2)^2 = 1/8 which is 4 times smaller than 1/2

  the answer is 4

• I don’t think it’s that simple. B seems correct in the absence of other forces.

• uphill or downhill

  what is your mass