Help fast What is the only force that can act on an object in free fall? gravity
friction
air resistance
speed

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

The speed of light can be used to measure the