Question

A trolley,while going down an inclined plane, has an acceleration of 2cm square . What will be its velocity 3seconds after the start

Answer 1

a = 2 cm/s^2 ; t = 3 s ; u = 0 m/s

As v = u + a t

or, v = 0 + 2×3 cm/s

so, v = 6 cm /s

Hence the trolley will have a velocity of 6m/s after 3 sec of start .

Answer 2

A = 2 cm ${s}^{-2}$

Initial velocity, u = 0

Final velocity , v = ?

Time , t = 3s

$\underline\textsf{Using\:1st\:equation\:of\:motion:-}$

v = u + at

v = 0 + 3 × 2

v = 6 m/s.