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The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is ...

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Mr3Hunna:
Question 1The speed of a 4.0-kg object is given by v = (2t) m/s, where t is in s. At what rate is the resultant force on this object doing work at t = 1 s?
◦ 48 W
◦ 40 W
◦ 32 W
◦ 56 W
◦ 16 W

Question 2The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?



◦ −12 J
◦ −17 J
◦ −20 J
◦ −8.0 J
◦ −28 J

jamesnevil303:
Answer 116 W

Answer 2−8.0 J

Mapo:
Thank You

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