Answer to Question #23309 in Mechanics | Relativity for Gabriel
Sally travels by car from one city to another. She drives for 29.0 min at 63.0 km/h, 37.0 min at 40.0 km/h, and 45.0 min at 74.0 km/h, and she spends 14.0 min eating lunch and buying gas.
(a) Determine the average speed for the trip.
(b) Determine the total distance traveled.
V - an average speed S - a total distance t - a total time
V = S/t S = V1*t1 + V2*t2 + V3*t3 t = t1 + t2 + t3 + t4
b) S = (29/60)h*63km/h + (37/60)h*40km/h +(45/60)h*74km/h =& 110.6 km a) V = S/t = 110.6 /( (29 + 37 + 45 + 14)/60 h) = 53.1 km/h