A car with good tires the ear is traveling at dry road can decelerate at about 5

Question

A car with good tires the ear is traveling at dry road can decelerate at about 5m^s^2 when braking. If the car is travelling at 89 km/h: how long does it take the ear to stop under these conditions? how far does the car travel during this time? Multiple choice A glider is on an inclined, frictionless track points downhill, At t = 0 the glider is at x = 0 and moving uphill. After reaching the high point of its motion, it moves downhill and returns to x = 0. Which of the following v_x -t graphs (graphs of velocity vs. time) best matches the motion glider? Consider (-) direction up the ram for vectors. The position of an object moving along the x-axis is given by x = 5.0 m - (4.0m/s)t + (2.0 m/s2)t^2 Which statement about this object is correct? For t > 0, the object is never at rest. The object is at rest at t = 0.5. The object is at rest at t = 1.0 s. The object is at rest at t = 2.0 s. More than one of B, C, and D is correct. If in the figure, you start from the Bakery, travel to the Cafe, and then to the Art Gallery in 2.00 hours, what is your Average speed? Average velocity?

Explanation / Answer

acceleration = -5 m/s^2

initial speed = 89 km/h or 24.72 m/s

when car stop its final velocity = 0 m/s

v = u + at

0 = 24.72 - 5 * t

t = 4.94 sec

time taken by car to stop = 4.94 sec

v^2 = u^2 + 2as

0 = 24.72^2 - 2 * 5 * s

s = 61.10784 m

distance car will travel = 61.10784 m

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