An object has an intial velocity of 11 m/s and a constant acceleration of 4.2 m/s squared. Hoe long will it take before it's final velocity is equal to 3 times its intial velocity?

An object's position as a function of time in one dimension is given by the expression; 3.89t2 + 2.22t + 7.48 where are constants have proper SI Units. What is the object's average velocity between the times t = 3.16 s and t = 8.38 s? with everything in 3 sig figs

An unwary football player collides head-on with a padded goalpost while running at 7.2 m/s and comes to a full stop after compressing the padding and his body by 0.28 m. Take the direction of the player’s initial velocity as positive Assuming constant acceleration, calculate his acceleration during the collision, in meters per second squared.    How long does the collision last in seconds?

What is her velocity at 15 s?

An object's position as a function of time in one dimension is given by the expression; 2.74t2 + 3.01t + 13.9 where are constants have proper SI Units. What is the object's average velocity between the times t = 4.06 s and t = 8.22 s?

At time t = 0 a particle starts moving along a line with equation of motion s(t) = t^3−4t^2+ 6, whereS is meters and t is in seconds.a) Give the velocity and acceleration functions.b) What is the velocity at time t = 2?c) When is the acceleration 2 m/s^2?