So i believe is exercise:)
Answer:
The awnser is d
Explanation:
i know cause i took the test
In my opinion, calling exercise "work" wouldn't be a good way of describing it, I don't think people would exercise if its called work
Acceleration = (final velocity-initial velocity)/time
5 = (v-0)/20
v = 100m/s
Answer:
The velocity and height is 31 m/s and 44.4 m respectively .
Explanation:
Given :
Initial speed of rock , u = 8.5 m/s .
Time taken to reach ground , t = 2.25 s .
Also , acceleration due to gravity is ,
.
Now , to find the velocity when it hit ground .
Applying equation of motion :

Also , height from which rock is thrown is given by :

Hence , this is the required solution .