Question

a body of mass 4kg initially at rest is subjected to a force of 16N .what is the kinetic energy aquired by the body at the end of 10sec?

Answer 1

pls let me know if right or wrong....

Answer 2

Hey,
U= 0
Mass of body= 4kg
Force = 16 N
Time =10 seconds

=We know that Force =Mass ×Acceleration
So, Acceleration =Force/Mass Acceleration =16/4 = 4 m/sec square

=Here we don't know 'V', To Find 'v' :
v = u + at
v= 0 + 4×10
v = 40 m/sec

= Now,
Kinetic Energy = 1/2 mv square
Kinetic Energy = 1/2 × 4 × (40)square
Kinetic Energy = 2 × 1600
Kinetic Energy = 3200 J

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