and what does the m/s stand for?
2007-11-05 10:12:00 · 5 answers · asked by s 1 in Science & Mathematics ➔ Mathematics
[05]
We know that the KE of a moving objet is given by the formula
1/2(mv^2),where m=mass of the object and v= velocity of the object in m/s
So,the kinetic energy of the car travelling at 20 meter/second is
1/2*4000*20*20
=800000 J
2007-11-05 10:21:15 · answer #1 · answered by alpha 7 · 0⤊ 0⤋
m/s is meters per second
the equation for kinetic energy is
E = .5 (m) (v^2)
m = mass = 4000kg
v = velocity = 20 m/s
so E = .5 (4000) (20^2)
E = 800000 J
J is joules
Erica is wrong... it has to be in kg.. not grams
joules = kg m / s
2007-11-05 10:17:34 · answer #2 · answered by IAmClifford 2 · 0⤊ 0⤋
Kinetic Energy = 1/2(mass)(velocity)^2
KE = 1/2(4000kg)(20m/s)^2
KE = 800000 J
m/s means meters per second, a the SI unit of speed.
2007-11-05 10:15:58 · answer #3 · answered by aaron.brake 3 · 0⤊ 0⤋
the equation is KE=0.5*mass*velocity*velocity, or Kinetic energy equals one half mass times velocity squared. Mass must be in grams not Kg.
2007-11-05 10:17:14 · answer #4 · answered by Anonymous · 0⤊ 0⤋
m/s is meters per second
K.E. = ½ m v²
If the mass m is in kg and v has units m/s, then K.E. has units of joules.
2007-11-05 10:18:27 · answer #5 · answered by Ron W 7 · 0⤊ 0⤋