The velocity of the spring oscillator is V at T1 and V at T2, and the direction is the same. It is known that (t2-t1) is less than the period T, then (t2-t1) () A. May be greater than a quarter of a cycle B. may be less than a quarter of a cycle C. must be less than a half of a cycle D. may be equal to a half of a cycle

The velocity of the spring oscillator is V at T1 and V at T2, and the direction is the same. It is known that (t2-t1) is less than the period T, then (t2-t1) () A. May be greater than a quarter of a cycle B. may be less than a quarter of a cycle C. must be less than a half of a cycle D. may be equal to a half of a cycle

Since (t2-t1) is less than the period T, A. when the position is near the maximum position and the velocity direction at T1 points to the equilibrium position, then (t2-t1) is more than one quarter of the period, so a is correct; B. when the position is near the equilibrium position and the velocity direction at T1 points to the equilibrium position, a is correct When it points to the equilibrium position, there is (t2-t1) less than a quarter of the period, so B is correct; C. when the position is near the equilibrium position and the velocity direction at T1 points to the maximum position, there is (t2-t1) more than half of the period, so C is wrong; D. when the position is near the equilibrium position and the velocity direction at T1 points to the maximum position, there is (t2-t1) more than half of the period One cycle cannot be equal to half cycle, so D is wrong; so select ab