A body is moving at 70km/h and has a mass of 130kg, calculate its maximum kinetic energy.
Firstly, the speed is not given in SI units, this is modified by changing the units from km/h to m/s by the following relationship; 70km/h = (70000/3600)m/s. Once this is complete the equation for kinetic energy is used, KE=(mv^2)/2 where m is the mass of the body, v is the speed of the body and KE is the kinetic energy of the body. The values derived and given in the question are then substituted into the equation to obtain a maximum kinetic energy of 2.46x10^4 joules.
JI
Related Physics A Level answers
All answers ▸What do you understand by simple harmonic motion?
Using Newton's law of universal gravitation, show that T^2 is proportional to r^3 (where T is the orbital period of a planet around a star, and r is the distance between them).
What is the change in temperature of 2kg of water heated by a kettle using a voltage of 230V at 0.5A of current for 10 seconds? Assume no heat losses.
A coil is connected to an analogue centre zero ammeter. A magnet is dropped (North pole first) so that it falls vertically and completely through the coil. What would be observe on the ammeter?