Problema Solution
how many joules of kinetic energy does a 750 kg. automobile traveling at a typical highway with a speed of 65 miles/hr. have?
Answer provided by our tutors
750 kilograms? Sounds more resolvable than 750 lbs! So, I wull go with kg and convert 65 mph to meters per second.
65 mi/h (1609 meter/1 mile)(1 hour/3600 seconds)
= 29.1 meters per second
now,
Kinetic Energy = 1/2mass(kg)*(m/s)2
KE = 1/2(750 kg)(29.1 m/s)2
= 3.2 X 105 Joules