Kinetic Energy and the Work/Energy Theorem:

Question

1.) How much kinetic energy does a 700-gram baseball have that is travelling at 20 m/s? What would be the kinetic energy if you doubled the mass? What would be the kinetic energy if you doubled the velocity?

3.How much work must gravity do on a 2-kg falling object in order to take it from rest to 20 m/s?

5.) A 5-kg box is sliding across a desk that has a coefficient of friction of 0.4. If the box is initially moving at 15 m/s, how far will the box slide before coming to rest. How can can you use the work or Kinetic Energy Theorem to solve this??

Answer 1

KE = 1/2 mv^2
W = KE
once again KE = Fd
The F is Friction = mu Fn = mu mg in this case.

Answer 2

A man of mass 90kg is moving at a constant velocity he has a kinetic energy of 2205kg calculate his velocity

Answer 3

A MASS OF 90KG IS MOVING AT A CONSTANT VELOCITY HE HAS KINETIC ENERGY OF 2205 CALCULATE THE VELOCITY

Answer 4

V=2205×90=198450

Answer 5

Is it 5000
Joules