1. (14 points) (a) A 250 kg crate is being pushed to the right by force F which varies with time in the manner shown. If

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1 14 Points A A 250 Kg Crate Is Being Pushed To The Right By Force F Which Varies With Time In The Manner Shown If 1 (59.77 KiB) Viewed 41 times

1. (14 points) (a) A 250 kg crate is being pushed to the right by force F which varies with time in the manner shown. If the initial velocity of the crate is 10 km/h at t = 0. Due to the friction, the final velocity decreases to 4 km/h in 5 s. Determine the coefficient of kinetic friction between the crate and the surface. 3. (14 points) A 300-g ball is struck with a velocity of VA = 25 m/s at point A as shown. Determine the time and the velocity components when the ball hits the ground at B. If the coefficient of restitution between the ball and the field is e= 0.4, determine the magnitude and direction the velocity of the rebounding ball at B. of F(N) B 150 15 2. (14 points) A 120-kg cart is moving to the right at a speed of 8 m/s with a 30-kg kid on it. At an instant, the kid jumps off the cart with a horizontal velocity v' = 10 m/s. Since the cart is moving, v' is a relative measurement with respect to the cart as shown. After the jump, what is velocity of the kid and in which he will move? 1(s) VA = 25 m/s 30% A