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as the acceleration is constant, to travel 1km=1000m, we use 1000 m =(1/2) (5 m/s^2)t^2, so t=sqrt(21000/5)=20 seconds

Momentum of an object is the product of its mass and velocity (p=m x v). Since mass is a scalar quantity and velocity is a vector quantity, we can derive that momentum must therefore be a vector quantity ...

At the drop height, the ball possesses 0J of Kinetic Energy (KE), and only possesses Gravitational Potential Energy(GPE). From GPE=mgh...GPE=O.5x9.91x10=49.05J. As it drops, its GPE decreases and its KE i...

1. Δx and Δp represent the uncertainty in position and the uncertainty in momentum respectively.
2. If x is known absolutely then p cannot be known at all.
3. This means that the precise p...

This question is on transformers. This is clear because there is a primary and secondary coil and a different voltage between the 2 coils. Transformers induce a changing voltage in a coil. The known equat...