A 20 N force acts on a 10 kg object parallel to the object's displacement. If the force acts for 32 m, what is the final kinetic energy, in J, of the object assuming it starts from rest?

Answer 1

a=F/m = 20/10=2 m/s².
s=(v²-vₒ²)/2a.
vₒ=0
v²= 2as.
KE=mv²/2= m2as/2=mas=10•2•32=640 J