1500m race runner starts the race with a velocity X and after 10s she covered a distance of 120m. She then triple her velocity for the next 5s. She again reduced her velocity to Y which took her 3s to complete the race. calculate :i)the value of X and Y
ii)The average velocity and total time

a and c

explanation:

both a and c are correct answers to my knowledge, it's been a bit since i've done anything related to magnetic fields, but it should be right.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.