You throw a g coin straight down at m/s from a -m-high bridge.
a. How much work does gravity do as the coin falls to the water below? b. What is the speed of the coin just as it hits the water?
a). J work does gravity do as the coin falls to the water below
b). The speed of the coin is m/s
Mass od the coin
Speed of the coin m/s
Height of the bridge m
As the coin fall downward it accelerates with as a result its velocity changes,
Hence by calculating a change in its kinetic energy in the duration till it hits the water surface,
For the equation of the motion:
Two identical horizontal springs are attached to opposite sides of a box that sits on a frictionless table. The outer ends of the springs are clamped while the springs are at their equilibrium lengths. Then a force applied to the box, parallel to the springs, compresses one spring by while stretching the other by the same amount. What is the spring constant of the springs?
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