Question

question 22 and 25

25. A playground is on the flat roof of a city school, 6.00 m above the street below (Fig. P.25). The vertical wall of the building is h = 7.00 m high, forming a l-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launch ing it at an angle of = 58.0° above the horizontal at a point d=24.0m from the base of the building wall. The ball takes 2.20 x to reach a point vertically above the wall. (a) Find the speed at which the ball was launched. (b) Find the vertical distance by which the ball clears the wall. (c) Find the horizontal distance from the wall Figure P4.21 to the point on the roof where the ball lands. 22. A landscape architect is planning an artificial water- fall in a city park. Water flowing at 1.70 m/s will leave the end of a horizon- tal channel at the top of a vertical wallh2.35 m high, and from there it will fall into a pool (Fig. PM.22). (a) Will the space behind the waterfall be wide Figure 1.22 Figure P4.25 enough for a pedestrian walkway (1) To sell her plan to 26. The motion of a human body through space can be the city council, the architect wants to build a model to modeled as the motion of a particle at the body's cen. standard scale, which is one-twelfth actual size. How fast ter of mass as we will study in Chapter 9. The compo- should the water flow in the channel in the model? nents of the displacement of an athlete's center of man 23. placekicker must kick a football from a point 36.0 m from the beginning to the end of a certain jump are AM (about 10 yarda) from the goal. Half the crowd hopes described by the equations Mthe ball will clear the crossbar, which is 3,05 m high When kicked, the ball leaves the ground with a speed 0.360m - 0.840 m+ (11.2 m/s)(sin 18.5) - 109.80 m/) +0+ (11.2 m/1)(cos 18.5) of 20.0 m/s at an angle of 58.0° to the horizontal (6) By how much does the ball clear or fall short of clearing where is in seconds and is the time at which the ath- the crowbar (b) Does the ball approach the crossbar lete ends the jump. Identify the athletes position while still rising or while falling? and (b) his vector velocity at the sakeoll point. How

Answer 1

According to CHEGG RULES and REGULATIONS I Supposed to answer one question at a time ...so I had solved 22 and if u want answer of 25 please upload it separately .....if u have any doubt please ask me in comment box ....

V = 1.70 m/s h 2.35 m. V 1.tom/s time of flight I h = Myt + £9t2 o + 1 gt² h. ny du t 2h (2 X 2035 9.8 t 46.06 6.787 sec son we have x = vt = 6.78 7× 1.70 Su 11.537 m enough space behind the waterfall for a pedestrian walkway (4x2.35) x 11.537) m si - v'-se ( m v' = 2*11 11-537 9.8x12 2 X 2.35 = 4.809 m/s water should flow with 4.81] m/s so