Question

find out the velocity of a body of mass 100 g having a kinetic energy of 20 J .
Calculate the work done in lifting 200 kg of mass to a vertical of 6 m .

Answer 1

Given:

mass (m)= 100g

K.E= 20J

Using the formula K.E= 1/2mv^2;

20= 1/2×100×v×v

20/50= v×v

0.4= v×v

v= 0.63 m/s

( idk if the answer is right.......the calculator showed root of 0.4 as 0.63)

Given:

mass= 200kg = 0.2g

height= 6m

by work-energy theorum;

work done = energy spent

therfore;

work done= mgh

( taking g=10m/s)

= o.2× 6×10

= 12J

HOPE THIS HELPED U!!