3.) Polish rider Ronnie Renner, was defeated by Socal newcomer Bryce Hudson at t

Question

3.) Polish rider Ronnie Renner, was defeated by Socal newcomer Bryce Hudson at the 2013 X-Games Step Up Competition in Brazil. Hudson cleared the Bar set at 31 feet, far below the world record height of 47 feet established by Renner at X-Games LA in 2012. Assuming that Hudson's motocross bike weighs 120 KG. Let's also assume that Bryce Hudson weighs 75 KG. Using conservation of energy alone, calculate the final velocity of Hudson's MX bike when it landed on the floor of the Step Up arena, after clearing the bar set at 31 feet. Choose from the closest answer below.

a. 34 m/s

b. 16.8 m/s

c. 13.6 m/s

d. 4.2 m/s

(please explain the answer)

4.) A block of mass m1 = 5.0 kg on a smooth horizontal surface pulled by a massless string, which is attached to a second block with mass m2 = 1.0 kg HANGING OVER A PULLEY. Assume that the pulley has no mass and is frictionless and that it merely serves to change the direction of the tension in the string at that point. The magnitude of the tension in the string is uniform, and the string itself is massless. Find the net acceleration of the system when the masses are allowed to move. Choose from the closest answer below

a. a = 6.2 m/s^2

b. a = 3.3 m/s^2

c. a = 1.63 m/s^2

d. a = 10.1 m/s^2

(please explain the answer)

Explanation / Answer

1)b. 16.8 m/s

2)c. a = 1.63 m/s^2

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