A ball of mass 250 g, having initial speed v, moves along a straight path under the action of a constant net force of 8 N. If the ball has speed v after 2.5 s of its journey, then the value of v is

Dear Student ,
Here in this case the initial speed and final speed after 2.5 s is same so , here the ball is moving in the straight line and in opposite direction say .
so, mVfinal-Vinitialt=Fv-(-v)=8×2·50·252v=80v=40 m/s
Regards

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ffu
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f=m(v-u)/t
320m/s
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320 m/s
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