At t=1.0s, a 0.63kg object is falling with a speed of 6.0 m/s. At t=2.0s, it...

Question

Question

At t=1.0s, a 0.63kg object is falling with a speed of 6.0 m/s. At t=2.0s, it has a kinetic energy of 25 J.

1. What is the speed of the object at t=2.0s?

2.How much work was done on the object between t=1.0s and t=2.0s?

science physics

Answer 1

Answer #1

Answer 2

Answer #2

$(a)\;K=\frac{1}{2}mv^{2}=>v=\sqrt{\frac{2K}{m}}=\sqrt{2*25/0.63}=8.9\;m/s$

$(b)\;Work\;done=Final\;kinetic\;energy-Initial\;kinetic\;energy=25-(0.5*0.63*6*6)=25-11.34=13.66\;J$

Answer 3

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