Nanu Nana said:Oh I see. I think I've found out which kinematic equation to use .
I tried this one
initial velocity = 140 km/h (38,89 m/s)
Final velocity = 0 m/s because its going to stop
(vx)^2=(u)^2 + 2x a x700 m
(38,89)^2=1400 x a
a= -1512,34/ 1400
a= -1,0802
Kinematics acceleration is the rate of change of an object's velocity over time. It is a vector quantity with both magnitude and direction.
Kinematics acceleration can be calculated by dividing the change in an object's velocity by the change in time. The equation for kinematics acceleration is a = (vf - vi)/t, where a is acceleration, vf is final velocity, vi is initial velocity, and t is time.
Kinematics acceleration refers to the change in an object's linear velocity, while angular acceleration refers to the change in an object's rotational velocity. Kinematics acceleration is measured in meters per second squared (m/s²), while angular acceleration is measured in radians per second squared (rad/s²).
According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass. This means that a larger force will result in a larger acceleration, while a larger mass will result in a smaller acceleration.
Kinematics acceleration affects motion by changing the velocity of an object. If the acceleration is positive, the object will speed up in the direction of the acceleration. If the acceleration is negative, the object will slow down in the opposite direction of the acceleration. If the acceleration is zero, the object will maintain a constant velocity.