Question

please help me solve the following questions. I think Ive got the answers for a-d. But I don't understand question e). please explain the steps for each question

Answer 1

Answer:

54.3N

Explanation:

Frictional force is given by (ų)(N)

Where ų is coefficient of friction and N is normal force

Hence Friction=45N

F-45=15a where F is the constant force

F=45+15a----(1)

Since distance(s)=5m

Time(t)=4s

Initial velocity(u)=0

Using s=ut+0.5(a)(t^2)

5=8a

a=8/5----(2)

Using (1) and(2)

We get F =54.3N

Hope this answer helped you