Answer:
Torque, 
Explanation:
It is given that,
Length of the wrench, l = 0.6 m
Mass of the wrench, m = 100 kg
We know that the torque applied by mechanic is given by :




So, the torque applied by the mechanic is 588 N-m. Hence, this is the required solution.
Answer:
there I think the answer is measuring tape we cannot use a metre rule because it measures straight lines and I think measuring tape is better because it is flexible thus makes measurement easier
Answer:
Explanation:
It is given that three cars has same mass m with speed 
suppose rest two cars also has same mass m
As there is no external force therefore momentum is conserved
Initial Momentum 

Final momentum 

where v=final velocity



thus final velocity is 
"There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed."
It would be 1kg of gold at 20c