What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

Can anybody me with this? ? (picture included.)

Amira pulls a 3 pound wagon 4 feet. how much work has she done?