H.W. help.....A car has kinetic energy?

15 ⤊

of 4.34 x 10^5 J when traveling at a speed of 26 m/s.?
What is its mass? Answer in units of kg.

2006-10-02 13:29:41 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics

ke=1/2 Mv^2
4.34*10^5J=1/2 M 26^2 M^2/s^2
4.34*10^5*2=676M
8.68*10^5=676M
M=868000/676=1284kg

2006-10-02 19:32:49 · answer #1 · answered by yupchagee 7 · 15⤊ 0⤋

The equation for kinetic energy is m(v^2)/2 = E so you know that E is 4.34 x 10^5 J and v is 26 m/sec , solve for m. You can do it!

2006-10-02 20:36:59 · answer #2 · answered by rscanner 6 · 0⤊ 0⤋