Answer:
a

b
The value is
Step-by-step explanation:
From the question we are told that
The mass of the person is
The horizontal velocity is
The mass of the shed is

The distance covered is

Generally from the law of momentum conservation we have that

Here
is the initial velocity of the shed which is 0 m/s

=>

Generally the workdone by friction is mathematically represented as

Here
is the final velocity of the person and the shed when they come to rest and the value is

Generally this workdone by friction is also mathematically represented as

=>

=>

=>

=>