A driver 1.8meter per second drives out horizontally from the edge of a vertical cliff and 3.0seconds later reaches the water below .How high was the cliff ?and what is the impact velocity of the driver?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

What is the magnitude of the gravitational force acting on the earth due to the sun?

Substances that assume the shape of their container, but do not have a definite size are called