6. Figure represents the total acceleration of a particle moving clockwise in a circle of radius 2.50 m at a certain instant of time. At this instant, find (a) the radial acceleration, (b) the speed of the particle, and (c) its tangential acceleration. 7. A simple pendulum has a mass of 0.250 kg and a length of 1.00 m. It is displaced through an angle of 15.0 and then released. What are (a) the maximum speed, (b) the maximum angular acceleration, and (c) the maximum restoring force? 9.A 12.0-g wad of sticky clay is thrown horizontally at a 100-g wooden block initially at rest on a horizontal surface. The clay sticks to the block. After impact, the block slides 7.50 m before coming to rest. If the coefficient of friction between the block and the surface is 0.650, what was the speed of the clay immediately before impact? 请敎一下，感谢@@" 附上题目网址 http://0rz.tw/ab4hJ --

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