Question

An object of mass 1.5 kg is moving with a velocity of 20 m/s. A force increases its velocity by 5 m/s. Find the work done by the force?​

Answer 1

Answer:

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Answer 2

Answer:

-210J

Explanation:

(K. E)v = 1/2 mv2

Where,

K. E = Kinetic energy of the object

v = velocity of the object

Kinetic energy when the object was moving with a velocity of 5 m/s

(K. E)5 = 1/2 × 20 × (5)2

(K. E)5 = 250 J

Kinetic energy when the object was moving with a velocity 2 m/s

(K. E)2 = 1 /2 × 20 × (2)2

(K. E)2 = 40 J

Work done = Change in kinetic energy

= 40 J – 250 J

= – 210 J