Physics is the law.
Everything else is opinion.

Free calculators, simulations and guides that turn the laws of nature into better decisions.

Kinetic Energy

Given
Mass 1,500 kg · Velocity 25 m/s
Kinetic energy
468,750 J
Solve it

Projectile Motion

Given
Launch speed 20 m/s · Launch angle 45 °
Range
40.79 m
Solve it

Electricity Cost

Given
Appliance power 2,000 W · Usage per day 3 hours · Electricity price 0.2 €/kWh
Cost per day
1.2 €
Solve it

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Gravity 9.81 m/s² · each bounce loses ~18% of its energy · tap to add more