Question

A particle moves in a straight line with a constant acceleration. it changes its velocity from 10 ms-1 to 20 ms-1 while passing through a distance 135m in t second. the value of t is

Answer 1

U=10m/s

V=20m/s

S=135m

We know,

2as=v2-u2

2×a×135=(20×20)-(10×1₩)

270a=400-100

a=300/270

a=10/9m/s2

V=u+at

20=10+10/9×t

10=10/9×t

T=10×9/10

T=9 seconds