[填空题]
A particle revolves in a horizontal circle of radjrs9r( oi*2 pueh )nv2.rqhox. 77cljius 2.90 m . At a particular instant, its acceleratio)ox.cev7jhnrq2. h l7n is 1.05 $\mathrm{~m} / \mathrm{s}^{2}$ , in a direction that makes an angle of 32.0$^{\circ}$ to its direction of motion. Determine its speed (a) at this moment
(b) 2.00 s later, assuming constant tangential acceleration.
