A vehicle accelerates uniformly along a straight road, increasing its speed from 4.0 ms-1 to 30 ms-1 in 13s.?

0 ⤊

a) Calculate its acceleration

b) Calculate the distance it moves in this time.

AS Physics homework, I'm really stuck, thanks.

2007-09-26 05:42:22 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Physics

a)

a = (v-u)/t

= (30-4)/13

= 2 ms^-2

b)

s = ut + 1/2at^2

= (4*13) + (0.5*2*13^2)

= 221m

2007-09-26 11:25:58 · answer #1 · answered by Anonymous · 0⤊ 0⤋

You should know (or be able to look up) the 3 dynamics formulae linking velocity, acceleration, distance and time. Then simply apply them.

2007-09-26 12:47:56 · answer #2 · answered by Anonymous · 0⤊ 0⤋

x = v(avg)t = (v0+v1)t/2 = 221 m
a = (v1-v0)/t = 2 m/s*2

2007-09-26 12:58:12 · answer #3 · answered by kirchwey 7 · 0⤊ 0⤋

why ?

2007-09-26 18:34:36 · answer #4 · answered by casinolover 2 · 0⤊ 0⤋