Respuesta :

When the cart was at Table

  • Normal reaction (N)=mg

Now acceleration due to gravity acting on the gravity.

  • When the air comes out of straw it tries to take the cart upwards.
  • But the force is equal to that of acceleration due to gravity but in opposite direction.

Hence.

[tex]\\ \sf\Rrightarrow F_{net}=0N[/tex]

  • So the cart doesn't move