Starting at timet t = 0 an object starts moving along a straight line. Its coordinate in meters is given by: x(t) = 7t - 4t ^ 3 in seconds. When it momentarily stops its acceleration is:

I need part d and e

A golf ball is fired straight up into the air from ground level. It reaches a maximum height at ℎ = 504 meters. The speed of the golf ball in meters per second is 99.41. Calculate the flight time in ttotal in seconds until the golf ball reaches the ground.

A dolphin swims 2.32 km/h. How far has the dolphin traveled after 4.3h (round your answer to the tenth)?

One of the fastest known animals is the Indian spine-tailed swift. A swift flies 2.80 km due north in a time of 32.8 s. a. What is its average velocity due north in meters per second? Enter a positive value if the average velocity is due north and enter a negative value if it is due south. answer in m/s b. What is its average velocity due north in miles per hour? Enter a positive value if the average velocity is due north and enter a negative value if it is due south. anser in mi/h

A marching band player walks directly north at a speed of 2.50 m/s for a time of 12.0seconds, turns 35.00to the east and walks at half that speed for another 15.0 seconds.What is the players total displacement and average velocity for the entire trip?

You get in your car and drive north, accelerating up to 60mph. Draw your velocity vector and acceleration vector some time during your acceleration. How would these change if you encountered traffic and started to brake?