A 2 0 kg projectile with initial velocity v 8 0 i m s experiences the variable force F 2 0t i 4 0t 2 j N, where t is in s (a) What is the projectiles speed at t 2 0 s (b) At what instant of time is the projectile moving parallel to the y axis

Question: A 2.0 kg projectile with initial velocity v = 8.0 i m/s experiences the variable force F = -2.0t i + 4.0t 2 j N,

A 2.0 kg projectile with initial velocity v = 8.0 î m/s experiences the variable force F = -2.0t î + 4.0t² ĵ N, where t is in s.
(a) What is the projectile’s speed at t = 2.0 s?
(b) At what instant of time is the projectile moving parallel to the y-axis?

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