Physic question??? Help please!!!!!

Posted on 2015-09-07 06:39:00 in Physics by MICHAEL

1. A car traveling 56.0 km/h is 25.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.11 s later.

(a) What is the magnitude of the car's constant acceleration before impact?
(b) How fast is the car traveling at impact?

2. An electric vehicle starts from rest and accelerates at a rate of 2.3 m/s2 in a straight line until it reaches a speed of 23 m/s. The vehicle then slows at a constant rate of 1.0 m/s2 until it stops.

(a) How much time elapses from start to stop?
(b) How far does the vehicle travel from start to stop?

3. The position of a particle as it moves along a y axis is given by
y equals left-parenthesis 2.0 cm right-parenthesis sine left-parenthesis pi ? t divided by 4 right-parenthesis comma with t in seconds and y in centimeters.

(a) What is the average velocity of the particle between t=0 and t = 2.0 s?

(b) What is the instantaneous velocity of the particle at t= 0, 1.0, and 2.0 s?

(c) What is the average acceleration of the particle between t=0 and t=2.0 s?

(d) What is the instantaneous acceleration of the particle at t=0, 1.0, and 2.0 s?

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