Question

a body of mass 3 kg is thrown with an initial velocity of 20m/s . what would be its kinetic and potential energy at the end of 2s

Answer 1

Answer:

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Answer 2

Explanation:

given values are

mass m = 3kg

initial velocity (u) = 20m/s

final velocity v is not given.

first we have to find final velocity v

we know v = u + at

here t is given as 2 seconds

now acceleration a = u/t = 20/2 = 10m/s^2

v = 20+10*2 = 20+20 = 40m/s

we know that kinetic energy is given by

1/2m(v-u)^2

1/2*3*(40-20)^2

3/2*20^2

3/2*400

3*200

600 kgm^2/s^2

now potential energy is given by mgh

but here h = 0 , so potential energy is also zero.

Iam not sure but please check the answer in case of kinetic energy, if wrong please correct me.