1.

The initial velcoity of particle vec(u)=4 hati + 3hatj. It is moving with uniform acceleration vec(a) = 0.4 hati+0.3 hatj . Its velocity after 10 seconds is :

Answer»

3 UNITS
4 units
5 units
10 units

Solution :Here we have
`vec(V)=vec(u) +vec(a)t=(4hati+3hatj)+10(0.4hati+0.3hatj)`
`=(4hati+3hatj)+(4hati+3hatj)`
`vec(V)=(8hati+6hatj)`
`|V|=sqrt((8)^(2)+(6)^(@))=10` units


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