Question

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Answer 1

Answer:

Option D

Explanation:

u=5m/s

a= -10m/s^2

v=0

v=u+a*t

0=5-10*t

10t=5

t=0.5s

s=ut+1/2at^2

s=5*0.5+1/2*(-10)*0.5*0.5

s=2.5-1.25

s=1.25

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Answer 2

Explanation:

initial velocity=5m/s and final=0

acceleration=-10m/s^2

v-u/t=a

t=v-u/a

=-5/-10=0.5second

by second kinematical equation,

s=ut+1/2at^2

=5×0.5+1/2×-10×0.5^2

=2.5-1.25

=1.25 m