Question

Ravi scored 70 and 75 marks in the first two-unit test. Calculate the minimum marks he should get in the third test to have an average of at least 60 marks.

Answer 1

Step-by-step explanation:

Given that,

Mass of elevator + passengers, M=1800Kg

Speed, v=2m/s

Friction force, f=400N

Power delivered, P=force×velocity.........(1)

Force acting downward,

F=mg+f

F=1800×10+4000

F=22000N

Put the value of F in equation (1)

P=22000×2

P=44000Watts

Answer 2

Answer:

kindly refer the attachment