Question

An object of mass 0.9 kg has a speed of 4.2 m/s at position 1 and a kinetic energy of 14.2 J at position 2. Calculate its kinetic energy at position 1, its speed at position 2, and the total work done on the object as it moves from position 1 to position 2.

(a) its kinetic energy at position 1
_________J

(b) its speed at position 2
__________m/s

(c) the total work done on the object as it moves from position 1 to position 2
____________ J

Answer 1

Lets assume that position 1 and position 2 are at the same level

Consider position 1

Kinetic energy ,

ANSWER:

=====================

Consider position 2

Kinetic energy ,

ANSWER:

=============

(c) when object reached position 2 from position 1 ,its velocity increased

so work is done on the object

ANSWER:

================