This is a tricky one but on my part I'd have to say depending on the contract A,B,C.
kinematics can be defined as a sub-discipline in physics aimed at understanding the motion of objects without considering the forces that move them.
- Classical mechanics refers to a physical theory that describes the motion of objects.
- Kinematics can be considered a branch of classical mechanics that studies the motion of objects but without considering the forces that move them.
- Kinematics describes the motion of objects and systems by using different types of information such as diagrams, numbers, equations and/or graphs.
In conclusion, kinematics is a sub-discipline in physics aimed at understanding the motion of objects without considering the forces that move them.
Learn more about kinematics here:
brainly.com/question/24486060
Answer:
Explanation: Scale only reads reaction force so we will find out reaction force of ground in different cases.
a ) Let R be the reaction force of floor in the first case.
Net force = R - mg
= mass x acceleration = 0 ( body is at rest ).
R = mg , scale will read his actual weight.
In the case of b) and c) also acceleration is zero hence
R - mg =0
R =mg ,scale will read his actual weight.
d) In this case there is acceleration of 3 m s⁻² in upward direction so
R - mg = ma
R = m( g+a) = 75 x ( 9.8 + 3 ) = 960 N
The reading of scale will be more than his actual weight .
It will read weight as 960/9.8 = 97.96 kg.
e) In this case body is going downwards
mg -R = ma
R = m ( g - a )
= 75 ( 9.8 - 3 )
= 435 N
= 435 / 9.8 kg
= 44.38 kg
So scale will read less than his actual weight.
