Question

a body of mass 5 kg starts moving from rest after 4 second its velocity is found to be 16 m/s calculate the force working on the body and its kinetic energy after 4 seconds

Answer 1

Answer:

mass=5kg

initial velocity =u=0

final velocity =v=16m/s

time =t=4sec

force=m(v-u/t)

=5*(16-0/4)

=5*(16/4)

=5*4

=20N

$kinetic \: energy = 1 \div 2mv {}^{2}$

K.E=1/2*5*16*16