Practice Pakistan questions with answers and explanations.
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At maximum height, final vertical velocity is zero.
0=20-10t gives t=2 s.
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Centripetal force is not a separate force type.
It may be supplied by tension, friction, gravity, or another force.
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Use v²=u²-2gh with v=0.
0=400-20h, so h=20 m.
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A particle in translational equilibrium has no acceleration.
It may be at rest or moving at constant velocity.
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Newton's second law gives F=ma.
F=5×4 = 20 N.
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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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Acceleration is net force divided by mass.
A=30/6 = 5 m/s².
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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.
