Answer:
starting position: 3 m
velocity: 3 m/s
Explanation:
at t=0 position= 3 m
velocity: (delta)position/(delta)time
(delta=change in)
velocity= (15-3)/(4-0)
velocity= 12/4
velocity= 3 m/s
1) false 2) false 3) true
Answer:
40N
Explanation:
the forces act in the same direction so we add the forces
Answer:
it depends only on the forces acting along the y axis I think
Answer:
The work done by friction is 456 kJ.
Explanation:
Given that,
Mass of Bob, m = 88 kg
After falling for 1 km, he is moving downward at 96 m/s. It is required to find the work done by friction over this distance. It can be calculated using work energy theorem as :

So, the work done by friction is 456 kJ. Hence, this is the required solution.