Answer to Question #314829 in Physics for petite

Question

A particle moves in a straight line with an initial

velocity of 30 m/s and constant acceleration 30 m/s2

.

(a) What is its displacement at t = 5 s? (b) What is its

velocity at this same time?

Answer 1

(a) What is its displacement at t = 5 s?

$$d=v_0t+at^2/2\\ =30\times 5+30\times 5^2/2=525\:\rm m$$

(b) What is its velocity at this same time?

$$v=v_0+at\\ =30+30\times 5=180\:\rm m/s$$