00-kg man is škiing across level ground at a speed of 14 m/s when he comes to the small slope 1.8 m higher than ground level shown in the following figure. -8.0 m 1.8 m a. If the skier coasts up the hill, what is his speed when he reaches the top plateau? Assume friction between the snow and skis is negligible. m/s b. What is his speed when he reaches the upper level if an 80-N frictional force acts on the skis? m/s v%3D

BOX 1.25m 34 Assuming no friction and the box starts at rest, what will be the speed of the box at the end of the ramp? m/s Word Bank: 4.9 We need the mass to calculate the speed 1.25 20 3.7 4.5 42.5

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4. If the work required to stretch a spring 0.25?? beyond its natural length is 12 ?? − ??, how much work is needed to stretch it 9 ?? beyond its natural length

3. Which of the following statements correctly describes the relationship between an objects kinetic energy and its speed? a. E k is directly proportional to the speed of the object b. E k is directly proportional to the speed squared of the object c. E k is inversely proportional to the speed of the object d. E k is inversely proportional to the speed squared of the object e. none of the above describe the relationship

Computation. A block is released from rest at the top of a 47-m long frictionless ramp inclined at 34° above the horizontal. What is the block's speed at the bottom of the ramp? v= m/s Record your numerical answer below, assuming three significant figures. Remember to include a "-" if/when necessary.

QUESTION 6 A small block slides down a frictionless track whose shape is described by y = (x^2) /d for x<0 and by y = -(x^2)/d for x>0. The value of d is 4.93 m, and x and y are measured in meters as usual. Suppose the block starts from rest on the track, at x = -2.42 m. What will the block s speed be when it reaches x = 0?   A 4.83 m/s   B 3.42 m/s   C 2.05 m/s   D 7.25 m/s

QUESTION 7 From the diagram below, what is the speed of the block when it reaches point A at the lowest point on the surface? 2.00-kg block with an initial velocity of 5.00 m/s down the track Frictionless track В 9.00 m 5.00 m A a. 11.2 m/s b. 9.70 m/s C. 14.2 m/s d. 15.7 m/s е. 12.7 m/s

Answer both or NONE   Question1 -  For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic energy, in kJ (kiloJoule)? Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.   Question2 -  For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. How much thermal energy is created in this process, in kJ (kiloJoule)? Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

A block 4-kg mass m located 7.0 m above the ground slid down on smooth inclind surface (35°) a. What is the speed of block when it reaches the bottom? b. How far does the block move on the incline smooth surface (15°) 4 kg Begin h d End 35° 150