please give me answers of these questions
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Q.9) Initial velocity (u)=30 m/s
Final velocity (v)=40 m/s
Time taken (t)= 2 s
So, acceleration (a)=v-u/t
=40-30/2
=10/2
=5
So, acceleration produced=5 m/s²
Q.10) Initial velocity (u)=20 m/s
As its speed decreases, so it comes to rest after some time.
So, Final velocity (v)=0 m/s
Acceleration (a)=0.4 m/s²
Time taken=t
So, a=v-u/t
0.4=0-20/t
0.4t=-20
t=-20/0.4
t=50
So, time taken=50 s
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