A car is moving at 100 km/hr.

Question

its mass is 950 kg. find it's ke.

Answer 1

KE = ½mv²,

 

where v is in m/s.

v= 100 km/h = 27.8 m/s

KE = ½(950kg)(27.8m/s)²=367,000 J

 

(I'm assuming 3 significant digits, though it could be just 2 or 1.)

Answer 2

Hey Sierra -- 950kg moving 100km/hr ... V is 100m/3.6s ... KE= 0.5mV*V ...

KE= 0.5(950)100(100)/(3.6*3.6) ~ 480E4/(36*0.36) ~ 40E4/(3*0.36) ~ 400kJ - 8% ...

KE ~ 400 - 32 ~ 370kJ ... Regards :)

Answer 3

Hi Sierra;

Good to hear from you again.

I am assuming that ke is Kinetic Energy.

ke=(1/2)mv²

ke=(1/2)(950 kg)(100 km/hour)²

ke=(1/2)(950 kg)(10000 km²/hour²)

ke=4750000 kg-km²/hour²