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Asked by Jana Last Modified
Answer 
Tasneem
Kinetic energy is given by the expression,
Where,
= Kinetic energy of the object moving with a velocity, v
m= Mass of the object
(i) Kinetic energy when the object was moving with a velocity 5 m s−1
Kinetic energy when the object was moving with a velocity 2 m s−1
Work done by force is equal to the change in kinetic energy.
Therefore, work done by force = 
= 40 − 250 = −210 J
The negative sign indicates that the force is acting in the direction opposite to the motion of the object.
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Mass of the object = 20 kg
Initial velocity (u) = 5ms-1
Final velocity (v) = 2ms-1
Work done in this case is always equal to change in kinetic energy
i.e.
1/2 m(v)² - 1/2 m(u)²
=1/2 × 20 × (2)²-1/2 × 20 × (5)²
=40 Joules - 250Joules
= -210 Joules
There is negative force acting on the object.
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