Question

a student ran around the track at a constant speed of 2 m/s. the arrow shows the starting point. 17. which statement best describes the students motion? a) at positions d and a, the velocities are the same but the speeds are different. b) at positions b and d, the accelerations are the same but the velocities are different. c) at points d and a, the speeds are the same but the velocities are different. d) at points c and d, the velocities are the same but the speeds are different.

Explanation:

Step1: Understand speed and velocity

Speed is scalar, velocity is vector.

Step2: Analyze motion on track

Student has constant - speed motion.

Step3: Evaluate points

At different points on curved part, directions change. So velocities are different while speed is constant. At positions B and D (opposite on curved part), speeds are same but velocities are different due to direction.

Answer:

B. At positions B and D, the speeds are the same but the velocities are different