Question #13bdf

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Answer 1 · 2018-01-25T00:31:27

We can use the equation #v=u+at# where:

#v=7# #ms^-1# (final velocity)
#u=0# #ms^-1# (initial velocity)
#a=7.9# #ms^-2# (acceleration)
#t=?# #s# (time)

Rearranging, #t=(v-u)/a=(7-0)/7.9=0.89# #s#

Answer 2 · 2018-01-25T00:36:25

The time required is 0.886 s.

Use the suvat formula

#v = u + a*t#

Plug in the data and solve for t.

#7 ms^-1 = 0 + 7.9 ms^-2*t#

#7.9 ms^-2*t = 7 ms^-1#

#t = (7 ms^-1)/(7.9 ms^-2) = 0.886 s#

I hope this helps,
Steve