Question

Use the figure to answer questions 13-14. The figure represents the parabolic trajectory of a ball going from a to e in Earth gravity but without air resistance. The initial velocity ofthe ball is v, at an angle θ to the horizon. The vertical dashed lines represent equal time interval, Δ e x(m) 13) The horizontal velocity at point c is A) B) C) 0 Vo cos (0) V. sin (0) D) E) V. depends on what g is along the path 14) The vertical velocity at point b is: A) B) C) 0 Vo cos (0)-ga V. sin (0)-gAt D) Vo sin (0)+ g (2At) 15) A merry-go-round completes one revolution in 40 s. What is the centripetal acceleration of a rider located at a distance 2 m from the center of the merry go-round? A) 1 D) π /200 m/s2 C) ㎡/ 100 m/s2

Answer 1

V_2 cos theta = V_0 The velocity in the direction remains same throughout the v_y - v_0 sin tehta - g delta t velocity of the path V = 2 I r/40 = 4 pi/40 - 0.5142 = pi/10 centripetal acceleration = v^2/r = 0.3142^2/2 = In case of any