Question

A 4 kg rock is rolling 10.0 m/s. Find its kinetic energy.

a. 20 J
b. 40 J
c. 200 J
d. 400 J

Answer 1

Answer:

(c)200J

Explanation:

Kinetic energy=1/2.m.v^2

K= 1/2.4kg .10^2=200J

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Answer 2

Given : Mass : 4 kg

Velocity : 10 m/s

Find - Kinetic energy

Solution - Kinetic energy of rolling rock can be calculated using mass and velocity by the formula KE = 1/2*m*v². In this formula, m represents mass and v represents velocity.

Now, keeping the values in formula to find kinetic energy.

KE = 1/2*4*10²

KE = 2*10²

KE = 2*100

KE = 200 Kilogram metre²/second² or Newton metre or Joules.

Hence, kinetic energy of rolling rock is c. 200 Joules.