A student standing on a cliff that is a vertical height d = 8.0 m above the level ground throws a stone with velocity v0 = 18 m/s at an angle θ = 21 ° below horizontal. The stone moves without air resistance; use a Cartesian coordinate system with the origin at the stone's initial position.

Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?

70 give a real life example showing how sensory neurons work with the motor neurons

Properties seen when one one substance changes to another are known as properties