2 Problems i need hlep with, Acceleation and Time

[Maury_702]

1. ok so i have my physics packet and i need help bad. the problem is...
How long does it take a car to cross a 45m wide intersction after the light turns green if it accelerates from rest to constant 14.3 m/sec^2
Find T

and

A Car accelerates along a straight road from rest to 495 km/h in 16 sec. what is the magnitude of its average acceleration
Find a= ? km per hour/ sec
Find a= ? m/s^2
2.i don't have much equations for this problem in any of my notes

 

[frozenguy]

1. ok so i have my physics packet and i need help bad. the problem is...
How long does it take a car to cross a 45m wide intersction after the light turns green if it accelerates from rest to constant 14.3 m/sec^2
Find T

and

A Car accelerates along a straight road from rest to 495 km/h in 16 sec. what is the magnitude of its average acceleration
Find a= ? km per hour/ sec
Find a= ? m/s^2
2.i don't have much equations for this problem in any of my notes

Do you the two velocity and position kinematic equations?

X_f=X_i+V_i*t+(a*t²)/2

V_f=V_i+a*t

Xf=final position
Xi=initial position
Vf=final velocity
Vi=initial velocity
t=time
a=acceleration

 

[Maury_702]

i do have the 2nd one but i don't see how they can help me

 

[frozenguy]

Try and use the first equation for your first problem.
You don't need more then that