Question

I need number 11

What is the ball's horizontal displacement 2 s after it leaves the kicker's foot? What is the ball's vertical displacement 2 s after it leaves the kicker's foot? d. 11. Gerri leaves the long jump takeoff board with a vertical velocity of 2.8 m/s and a horizontal velocity of 7.7 m/s. a. What is Gerri's resultant velocity at takeoff? b. What is Gerri's takeoff angle-the angle of her resultant takeoff velocity with horizontal? c. What is Gerri's horizontal velocity just before she lands? What is Gerri's vertical velocity at the end of her 0.71 s flight? e. f. If Gerri's center of gravity was 1.0 m high at the instant of takeoff, how high will it be at the peak of her flight? g. How high is Gerri's center of gravity at the end of her flight, when she first hits the pit? Louise spikes a volleyball. At the instant the ball leaves her hand, its height is 2.6 m and it resultant velocity is 20 m/s downward and forward at an angle of 60° below horizontal. a. How long will it take for the ball to strike the floor if the opposing team does not block i b. How far will the ball travel horizontally before it strikes the floor?

Answer 1

V^rightarrow = V_x i^cap + V_y j^cap = 7.7 i^cap - 2.8 j^cap Magnitude of velocity = squareroot (7.7)^2 + (- 2.8)^2 = squareroot 59.28 + 7.84 = squareroot 67.12 = 8.19 m/s tan theta = P/b = 2.8/7.7 = 0.36 theta = tna6 - 1(0.36) = 19.8 degree Horizontal component of velocity does not change in projectile Motion X = u_x t + 1/2 a_x t^2 = 7.7 times 0.71 + 1/2 times 0 times (0.71)^2 = 5.467 meter