# Physics

posted by .

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. If the object is released from rest after it is lifted, what is its kinetic energy just before it hits the floor? What is its velocity? Show your work and units.

• Physics -

Ke = (1/2) m v^2 = m g h = .55*9.81*3.5 joules

v = sqrt (2 g h) - sqrt (9.81*3.5) m/s

## Similar Questions

1. ### physics

Two objects are connected by a light string passing over a light, frictionless pulley as in the diagram. m1 = 4.50 kg, m2 = 2.10 kg, and h = 4.30 m. The 4.50 kg object is released from rest at a point 4.30 m above the floor. Determine …

3. ### physics

A 6.9-kg box is being lifted by means of a light rope that is threaded through a single, light, frictionless pulley that is attached to the ceiling.Lifted at a constant speed of 2 m/s. If the box is lifted, at constant acceleration, …
4. ### Physics

Object A has mass mA = 9 kg and initial momentum A,i = < 19, -7, 0 > kg · m/s, just before it strikes object B, which has mass mB = 12 kg. Just before the collision object B has initial momentum B,i = < 5, 6, 0 > kg · …
5. ### physics

A 20 kg object falls from a height of 30 meters. How many joules of kinetic energy will the object have just before it hits the ground?
6. ### physics

a superball of mass .125 kg is dropped onto a concrete floor from a height of 1m it bounces back at a height of .9m. What is the net force acting on the ball before and after its released?
7. ### Physics

An object of mass .550kg is lifted from the floor to a height of 3.5m at a constant speed. How much work is done by the lifting force (include units)?
8. ### Physics

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. The work done on object A is 500J. After the force pulled each object, object A moves twice as fast …
9. ### Physics

How much work is done in lifting a 6kg object from the ground to a height of 4m?
10. ### Physics

The 10 kg mass is released from rest at a height of 1m above the floor. If the co-efficient of kinetic friction between the 5 kg mass and the table is 0.28, what will be the speed of the 10 kg mass just before it hits the floor?

More Similar Questions