Now imagine that a 0.2 kg baseball is moving at 30 m/s toward the batter. The ball is struck with a bat producing a force of 2000 N, which causes it to move in the opposite direction at 50 m/s. For how long was the ball in contact with the bat?

Given that,

Mass of a baseball, m = 0.2 kg

Initial speed of a baseball, u = 30 m/s

Force produced by a bat, F = 2000 N

Final speed of a baseball, v = -50 (negative for opposite direction)

To find,

For how long was the ball in contact with the bat?

Solution,

Let for t seconds the ball is in contact with the bat. The net force acting on the  ball is given by :

So, the ball is contact with the bat for 8 ms.

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )