Question

How to use kinetic energy to calculate velocity

Kinetic Energy:
150,000J

Mass:
120kg

Answer 1

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

Explanation:

the formula for kinetic energy is the integral of momentum (Force)(Speed), so when you take the integral you have to add the 1/2 to ensure that the equation is correct. In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.

Answer 2

we are given

mass is 120kg

Energy is 150000J

`m=120kg`

`E=150000J`

now, we can use kinetic energy formula

`E=(1)/(2) mv^2`

where

E is energy in J

m is mass in kg

v is velocity in m/s

so, we can plug these values and find v

`150000=(1)/(2) (120)*v^2`

now, we can solve for v

we will get

`v=50m/s`............Answer