The second floor of a house is 6m above street level. how much work is reguired to lift a 300 kg refrigerator to the second story?

17.658kJ

Explanation:

The work done in lifting the refridgerator is given my

W = F.d

Where W = Work done, F = Force and d = distance/height to be covered by that force = 6m

But F = mg (this work is done against gravity)

Where m = mass of fridge and g = acceleration due to gravity.

F = 300kg × 9.81m/s^2

= 2943N

W = Fh (where h is the height to be scaled by the force)

W = 2943 × 6

W = 17658J

17.658kJ of work is needed to lift the refridgerator to a height of 6m

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer