Question

A car is stopped at a red light. When the light turns green, the driver accelerates the car at a constant rate of +5.0 m/s2 for 7.0 seconds. The car’s total displacement is? m.

Answer 1

v=u+at where v=final velocity, u=initial velocity, a=acceleration, t=time.
Here t=6 seconds, a=+5 m/s2 and u=0 as the car is initially at rest.
Thus v=0+(5)(7)
v=35m

Answer 2

s=ut + 1/2at^2
=0×7.0 + 1/2 ×5×7×7 (u=0 ;as the body was at
rest)
=0+122.5
= 122.5m

so displacement =122.5m


HOPE IT HELPS
THANK YOU.