Question

a bus moving along a straight line at 20m/s undergoes an acceleration of 4 m/s2.after 2 s it's speed ​

Answer 1

Explanation:

Initial speed (u) =20m/s

Acceleration (a) =4m/s^2

Time taken (t) =2s

Final speed (V) =?

As we know,

V = u+ at

=> V = 20 + 4×2

=> V = 20 + 8

=> V = 28m/s

Hence, speed after 2s is 28 m/s Ans.

Answer 2

u=20

a=4

t=2

we have a formula v=u+at

v=20+4×2

=20+8

v=28