Practice Pakistan questions with answers and explanations.
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Opposing forces subtract.
Net force = 50-20 = 30 N.
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Use a=F/m.
A=12/4 = 3 m/s².
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Centripetal force is mv²/r.
F=2×36/4 = 18 N.
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Centripetal acceleration is v²/r.
A=100/20 = 5 m/s².
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Acceleration is F/m = 4 m/s².
Change in velocity is at=4×3 = 12 m/s.
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The net force is 80-20 = 60 N.
Acceleration is 60/15 = 4 m/s².
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In ideal free fall, air resistance is neglected.
All objects then have the same gravitational acceleration locally.
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Average speed equals distance divided by time.
120/10 = 12 m/s.
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Displacement is 14-2 = 12 m.
Average velocity is 12/4 = 3 m/s.
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Average speed uses total distance.
400/80 = 5 m/s.
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The runner returns to the starting point, so displacement is zero.
Average velocity is therefore zero.
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Use v=u+at with u=0.
V=0+3×4 = 12 m/s.
