True or false. motion is a change in direction. if false change direction to a word that makes it true

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is