calculate the kinetic energy of
a. A 1kg trolley traveling at 2m/s.
b. A 2g (0.002kg) bullet traveling
at 400m/s.
c. A 500kg car traveling at 72km/h.
I want answers
KE= 1/2 mass* velocity^2
Do you have any questions on how to do that? Mass is in kg, velocity in m/s, and energy will be in joules.
a. kinetic energy of a trolley= 1/2*m*v^2
= 1/2*1*2^2
=2J
b. kinetic energy of a bullet= 1/2*0.002*400^2
= 160J
c. v= 72km/s =72000/3600 =20m/s (SI unit)
kinetic energy of a car= 1/2*500*20^2
= 100000J
To calculate the kinetic energy, we can use the formula:
Kinetic Energy (KE) = (1/2) * mass * velocity^2
a. For a 1kg trolley traveling at 2m/s:
KE = (1/2) * 1kg * (2m/s)^2
= 1kg * 4m^2/s^2
= 4 Joules
b. For a 2g (0.002kg) bullet traveling at 400m/s:
KE = (1/2) * 0.002kg * (400m/s)^2
= 0.002kg * 160000m^2/s^2
= 320 Joules
c. For a 500kg car traveling at 72km/h:
First, convert km/h to m/s:
72 km/h * (1000m/km) * (1h/3600s) = 20 m/s
KE = (1/2) * 500kg * (20m/s)^2
= 500kg * 400m^2/s^2
= 200,000 Joules