Ineed a better understanding of this.. and you!

Question 1:

Looking for: "speed" (velocity: v)

Given: 112.0 meters (distance: d) 4.0 seconds (time: t)

Formula used: v=d/t

since velocity is equal to the distance (112m) divided by the time (4sec) you would have 112m/4s which is 28m/s. m/s is meters traveled per second traveling aka meters per second.

Question 2:

Looking for: average "speed" don't let the word average confuse you it is still velocity.

Given: 60km (distance: d) and 3.5 hours (time: t)

Formula required: v=d/t

Since velocity needs to be in the units of m/s first convert your time, which was provided in hours, to seconds.

3.5 hours 60 minutes per hour: 3.5 x 60= 210 minutes

210 minutes 60 seconds per minute: 210 x 60= 12600 seconds

also, kilometers needs to be converted to meters. The prefix kilo means 1000 so 1 kilometer = 1000 meters.

60 x 1000 = 60,000 meters

Plug the values into the equation required:

v=d/t

v= 60,000m / 12,600sec

v= 4.76 m/s

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.