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The vector position of a particle varies in time according to the expression r-7.40 i-8.20t2 j where r is in meters and t is in seconds. (a) Find an expression for the velocity of the particle as a function of time. (Use any variable or symbol stated above as necessary.) m/s (b) Determine the acceleration of the particle as a function of time. (Use any variable or symbol stated above as necessary.) m/s2 (c) Calculate the particles position and velocity at t-4.00 s. m/s Need Help?RWatchI

Suppose the position vector for a particle is given as a function of time by r(e)x(i+y(ej, with x() at +b and yt) - ct2+ d, where a 1.10 m/s, b 1.50 m, c 0.124 m/s2, and d 1.04 m. (a) Calculate the average velocity during the time interval from t 1.95 s to t 3.85 s m/s (b) Determine the velocity at t- 1.95 s m/s Determine the speed at t 1.95 s m/s Need Help? Read It

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(m/s) ccelena 0 m/s dt Sare = 5.7 35 1 t a、878 j2. こ8,645 1十1.512 j -LVv 1-101+0.72 J m/s Now) velocitl is given b 卜 dt at t= 1.9s s m/S And speed isgiven bal 키

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