UK 1 GERAK PARABOLA no 4 essai B intanpariwara 2022 2023

4. A golf ball is hit from a cliff in the X–Y plane. Immediately after the golf ball is hit, its velocity is (8i−3j) m/s. The acceleration of the golf ball with respect to time at t is a x ​ =(6t+4) m/s 2 and a y ​ =(−4t+8) m/s 2 . Determine: a. the velocity vector at t=3 s; b. the velocity vector at t=1 s; and c. the magnitude of the velocity at t=2 s.