Question

an object is moving up an inclined plan. its velocity changes from 15m/s to 10m/s in two seconds .what is it acceleration

Answer 1

you should say retardation
anyways,
a=v-u/t=10-15/2=-2.5m/s^2

Answer 2

hey your ans is here
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given
u=15
v=10
t=2
a=v-u/t
a=10-15/2
a=-2.5
and retardation =2.5
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hope it helps!