The jamaican bobsled team hit the brakes on their sled so that it decelerates at a uniform rate of 0.43 m/s squared how long does it take to stop if it travels 85 m before coming to rest

The distance covered by a certain object which is travelling at a certain speed is calculated through the equation,

     d = (V₀)t + 0.5at²

where d is the distance, V₀ is the initial speed, a is deceleration, and t is the time. Substituting the known values,

    85 = (V₀)(t) + (0.5)(-0.43 m/s)(t²)

Because we are not given with the initial velocity, our answer would remain as the equation which is written above. 

Time taken, t = 19.86 seconds    

Explanation:

It is given that,

Deceleration of the sled, a = -0.43 m/s²

We have to find the time it take to stop if it travels 85 m before coming to rest i.e final velocity v = 0. Using third equation of motion as :

u = 8.54 m/s

The initial velocity of the sled is 8.54 m/s. For finding time taken by the sled to stop can be calculated using second equation of motion as :

On solving the above quadratic equation we get, t = 19.86 seconds. Hence, this is the required solution.        

electrical power

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.