Question

urgente por favor..............​

Answer 1

vm= ∆s/∆t

3x10^8 = 3,9x10^8

______-----------------

___________∆t

3x10^8∆t= 3,9x10^8

∆t= 3,9x10^8

___----------------

____3x10^8

∆t=1,3 segundos