A child riding a bicycle at 15 meters per second decelerates at the rate of 3.0 meters per second squared for 4.0 seconds. What is the child's speed at the end of 4.0 seconds?

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Answer 1 · 2017-03-06T12:15:35

#3ms^(-1)#

we have

#v_(i)=15ms^(-1)#

#v_f " to find"#

#a=-3ms^(-2)#

#t=4s#

we use teh constant acceleration equation

#v_f=v_i+at#

#v_f=15+(-3xx4)#

#v_f=15-12=3ms^(-1)#