CBSE Class 9 Answered
A body of mass 5 kg is initially at rest is subjected to a force of 20N. find the kinetic energy accquired by the body at the end of 10 seconds.
Asked by | 27 Dec, 2012, 11:03: AM
Expert Answer
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
Answered by | 27 Dec, 2012, 02:44: PM
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