Question

Derive the relation between Work and Kinetic Energy (5)

(a) A man X goes to the top of a building by a vertical spiral staircase. Another

man Y of the same mass goes to the top of the same building by a slanting

ladder. Which of the two does more work against gravity and why?

(b) In loading a lorry, a porter lifts a carton of 150 N each through a height of 1.0

m.

i. How much work does he do in lifting one carton ?

ii. How much energy is transferred when one carton is lifted ?

iii. If the porter lifts 5 cartons per minute , at what power he is working?​

Answer 1

In other words, the work done is equal to the change in K.E. of the object! This is the Work-Energy theorem or the relation between Kinetic energy and Work done. In other words, the work done on an object is the change in its kinetic energy. W = Δ(K.E.)

Answer 2

Answer:

this hshsishwhjsjksggwqjkas I love this aasjushdidd