What is the mass of an object travelling at 15 m/s with a kinetic energy of 100 J?
Kinetic Energy (Ek) = 1/2(mv2).This can be rearranged such that, m = (2Ek)/v2we know from the question that Ek = 100 J and we know that v = 15 m/sso plugging in the numbers, we get m = (2 x 100)/(15)2 = 200/225 = 0.89 Kg (to 3 significant figures)
TD
Related Physics GCSE answers
All answers ▸An airplane accelerates steadily from rest to 355 m/s, after travelling a distance of 105,000 m. How long, in minutes, does it take the airplane to reach this speed?
If a car has a mass of 670kg and has a driving force of 1200N and a force from resistance of 300N, what is the acceleration of the car? What is the speed of the car after 5 seconds?
How do I remember all the formulas I will need for questions.
What is terminal velocity?