Answer:

a

b

Explanation:

From the question we are told that

The distance travel in 4.22 s is

The mass of the cart plus the fan is

Generally from kinematic equation we have that

Here u is the initial velocity with value

So

=>

Generally the net force is

=>

=>

Gnerally the new mass of the cart plus the fan is

The distance considered is

Generally the new acceleration of the cart is mathematically represented as

=>

=>

=>

Gnerally from kinematic equation we have

Here u is the initial velocity and the value is zero because it started from rest

=>

=>