A ball of mass 100 g moving with a speed of 4 m/sec strikes a horizontal surface at an angle of 30º from the surface. The ball is reflected back with same speed and same angle of reflection find
Text Solution
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CHECK THE SOLUTION.
0.4 kg-m/s zero
Sol. P i = 200 × 10 –3 ( 
)
P f = 200 × 10 –3 ( 
)
|P i | = |P f |
Δ P = |P f | – |P i | = 0
| Δ P| = |P f – P i | = |(200 × 10 –3 
i – 200 × 10 –3 
) – (200 × 10 –3 
i + 200 × 10 –3 
)|
| Δ P| = |2 × 200 × 10 –3 
| = 0.4 kg m/sec.
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