Question

a) find the velocity of a body of mass 100 g having a kinetic energy of 20.
b) Calculate the work done in lifting 500 kg of mass through a vertical distance of
12.5m (g=9.8 m/s2)​

Answer 1

Explanation:

Let v be the velocity of object ,

Given that mass of object , m=100 g=

1000

100

kg=0.1 kg

& kinetic energy of object =20 J

K.E =

2

1

mv

2

20=

2

1

×0.1v

2

⟹v

2

=400

⟹v=20 m/s