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例 1 一物体做匀加速直线运动 ,在某时刻前的ｔ1 内的位移是Ｓ1 ,在该时刻后的ｔ2 内的位移是Ｓ2 ,则物体的加速度是 ( )。Ａ 2 (Ｓ2 ｔ1 -Ｓ1 ｔ2 )ｔ1 ｔ2 (ｔ1 +ｔ2 ) Ｂ Ｓ2 ｔ1 -Ｓ1 ｔ2ｔ1 ｔ2 (ｔ1 +ｔ2 )Ｃ 2 (Ｓ1 ｔ2 -Ｓ2 ｔ1 )ｔ1 ｔ2 (ｔ1 +ｔ2 ) Ｄ
Example 1 An object performs a uniform acceleration linear motion. The displacement within a time t1 before a certain moment is S1, and the displacement within a time t2 after that moment is S2, then the acceleration of the object is (). A 2 (S2 t1 -S1 t2 )t1 t2 (t1 +t2 ) B S2 t1 -S1 t2t1 t2 (t1 +t2 )C 2 (S1 t2 -S2 t1 )t1 t2 (t1 +t2 ) D