Asked by Fiona

1)How much work is done by a person lifting a 2 kg object from the bottom of a well at a constant speed of 2m/s for 5 s. Is the answer mgh=2*9.8*10m
2)A 2kg block slides on a rough horizontal surface. A force (magnitude = 4N) acting parallel to the surface is applied to the block. The magnitude of the block¡¦s acceleration is 1.2m/s. If F is increased to 5N the magnitude of the block¡¦s acceleration is? I thought the answer would be a=F/m =5/2 but I think I am suppose to use the 1.2m/s and 4N in some way.
Answered by bobpursley
yes on 1)
2) YOu have to find friction first.

applied force - friction = m*a
so you know applied force 4N, m=2kg, and you are given a=1.2 so you can find friction.

Now friction force depends on mass, so if you increase F to 5N
use the same equation to find acceleration, youj know mass, and frictiona.
Answered by david
1- is incorrect lmfao
Answered by david
l m a o
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