A Body of Mass 5 kg Initially at Rest is Subjected to a Force 20 N — What is the Kinetic Energy Acquired by the Body at the End of 10 Second.
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A body of mass 5 kg initially at rest is subjected to a force 20 N — what is the kinetic energy acquired by the body at the end of 10 second is a typical physics problem that can be solved using kinematics and work-energy theorem.
Step 1: Find acceleration and velocity
Using Newton’s second law:
Force (F) = mass (m) × acceleration (a) →
20 N = 5 kg × a →
a = 4 m/s²
Since the body starts from rest, the velocity (v) after 10 seconds is:
v = a × t = 4 × 10 = 40 m/s
Step 2: Calculate Kinetic Energy (KE)
Kinetic energy formula:
KE = ½ m v² = ½ × 5 × (40)² = ½ × 5 × 1600 = 4000 Joules
Interpretation
After 10 seconds of constant force, the body gains a velocity of 40 m/s, resulting in a kinetic energy of 4000 J. This energy comes from the work done by the force over the displacement during those 10 seconds.
Note: This calculation assumes the force remains constant and no other forces (like friction) act on the body — ideal condition.
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