A 70 N block and a 35 N block areconnected by a string as shown. If the pulley i

Question

   A 70 N block and a 35 N block areconnected by a string as shown. If the pulley is massless and thereis no friction, the magnitude of the acceleration of the 70 N blockis? I know the answer is 3.3 m/s2 but I keep getting4.9 m/s^2 Thank you    A 70 N block and a 35 N block areconnected by a string as shown. If the pulley is massless and thereis no friction, the magnitude of the acceleration of the 70 N blockis? I know the answer is 3.3 m/s2 but I keep getting4.9 m/s^2 Thank you

Explanation / Answer

The equation of motion are 70 - T = (70 / 9.8) a and T - 35 = (35 / 9.8) a Adding above two equations we get       70 - 35 = (7.14 + 3.57) a ==> a = 35 / 10.71 ˜ 3.3m/s2

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