Question

A car starts at rest and travel a distance 20m in 1sec.The car average speed is?

Answer 1

we know ,
s= 1/2 at^2
or, 20 = 1/2 ×a×1^2
or, a=40 m/s^2
then,
v^2 =u^2 +2as. (v is average velocity/
or, v^2 = 2×40×20. (as, u=o)
or, v = 40 m/s.