The ball you will fire has a mass of 12.2 g. The gravitational field of the planet is 9.00 N/kg
The ball falls a vertical distance of 812.0 mm as it goes from the launcher to the ground.
Click on the zoomed in view of the launcher to fire the ball.
Use the acceleration due to gravity to find the time of flight.
Find the vertical speed of the ball right before hitting the ground.
Based on where the ball lands, determine the launch speed of the ball.

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative