15. A force F, = 210N pulls right on a 30-kg object. Another force, F2 = 330 pulls left on the object. What is the object's rate of acceleration? I A. 4 m/s2 B. 18 m/s2 C. -18 m/s2 D. 4 m/s2 9​

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Carbon 14 is a naturally occurring stable