Question

b) A body of mass 5kg initially at rest is subjected to a force of 20 N What is the kinetic

energy acquired by the body at the end of 10 s?​

Answer 1

Answer:

4000 joule

Explanation:

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Answer 2

Explanation:

Given that m = 5 kg

F = 20 N

u = 0

t = 10 s

v = ?

KE = ?

Acceleration

= 4 m/s2

Apply Kinematic Equation

v = u + at

v = 0 + (4) × (10)

v = 40 m/s

Hence K.E acquired by a body

K.E = 0.5 mv 2

= 0.5 × 5 × (40)2

= 0.5 × 5 × 1600

= 4000 J