A particle is moving in a straight line under constant acceleration. It travels 15m in the 3rd second and 31m in the 7th second. The initial velocity and acceleration are _______.
A. 5 m/s, 4 m/s²
B. 4 m/s, 5 m/s²
C. 4 m/s, 4 m/s²
D. 5 m/s, 5 m/s²
Answer:A
A particle is moving in a straight line under constant acceleration. It travels 15m in the 3rd second and 31m in the 7th second. The initial velocity and acceleration are _______.
A. 5 m/s, 4 m/s² B. 4 m/s, 5 m/s² C. 4 m/s, 4 m/s² D. 5 m/s, 5 m/s²