kinetic energy

Question 1

what is kinetic energy

Answer 1

the energy stored in moving objects

Question 2

what is the equation for kinetic energy

Answer 2

Ek = 0.5 x m x V^2
Ek= kinetic energy(J)
m= mass(kg)
V= speed(m/s)

Question 3

a car with a mass of 700kg is moving with a speed of 20 m/a. Calculate the kinetic energy of the car

Answer 3

140 000J
Ek= 0.5 x m x V^2
Ek= 0.5 x 700 x 20^2
Ek= 140 000J

Question 4

A cyclist and bike have a total mass of 100 kg and a speed of 15 M/S calculate the kinetic energy

Answer 4

11250J
Ek= 0.5 x m x V^2
Ek= 0.5 x 100 x 15^2
Ek= 11 250J

Question 5

A tennis ball is travelling at 50 m/a amd has a kinetic energy of 75J. Calculate the mass of the tennis ball

Answer 5

0.06kg
Ek = 0.5 x m x V^2
M = Ek / 0.5 x V^2
M = 75/ 0.5 x 50^2
M = 0.06kg