3. At a roller skating rink, a boy and a girl push straight ahead. The masses of the boy and the girl are 60.0
kg and 50 kg, respectively. During the push, the boy accelerate at 1.5m/s? What is the acceleration of
the girl?
a. 1.8m/s
b 1.4m/s
c. 2.8m/s2
d. 24m/s.
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Answer: Force of boy on girl = force of girl on boy = ma = (60)(1.5) = 90 N ANS
acceleration of girl = F/m = 90/50 = 1.8 m/s² ANSWER IS: C. 2.8m/s2