Multiple choice

A particle is thrown vertically up from the earth with a velocity of 9.8 m/s. At what height will its kinetic energy be reduced to 3/4 of its original kinetic energy?

  1. 1.225 m

  2. 1.250 m

  3. 1.200 m

  4. 1.215 m

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Loss in kinetic energy of the particle = Gain in potential energy of the particle

(1/4) * (1/2) * m* v*v = m * g * h

( 1/8) * m * 9.8 * 9.8 = m * 9.8 * h
h = (1/8) * 9.8 h = 1.225 m