Question

A lift travelling up to the top floor of the Empire State building with a mass of 4200kg and a kinetic energy of 4116J. find the velocity

please helpp

Answer 1

`v = 1.4 m/s`

(v= velocity)

Step-by-step explanation:

Kinetic Energy is computed using the formula


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

where m = mass of the object in kg and v is the velocity in m/s

Given KE = 4116J,
m = 4200 kg

Substitute and solve for v

`4116 = (1)/(2)4200\cdot v^2`

=>
`4116 = 2100\cdot v^2`

`v^2 = (4116)/(2100)\\\\v^2 = 1.96\\\\v = √(1.96)\\\\v = 1.4 m/s`