T 3.)A car traveling at 21 m/s misses the turnoff
on the road and collides into the safety
guard rail. The car comes to a complete
stop in 0.55 s.
a. What is the average acceleration of the
car?
b. If the safety rail consisted of a section
of rigid rail, the car would stop in
0.15 s. What would be the acceleration
in this case?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

In physics the desire of an object to keep doing what it is doing is termed?

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse