A ball of mass 3   kg , moving with a speed of 100   m   s - 1 , strikes a wall at an angle…

A ball of mass 3 kg, moving with a speed of 100 m s-1, strikes a wall at an angle 60° (as shown in figure). The ball rebounds at the same speed and remains in contact with the wall for 0.2 s; the force exerted by the ball on the wall is:

  1. 15003 N
  2. 1500 N
  3. 3003 N
  4. 300 N

Solution

Change in momentum, ∆p=m∆v

⇒∆p=3100cos30°

⇒∆p=3×2×100×32

⇒∆p=3003

∆F=∆p∆t

⇒∆F=30030.2=15003 N

Asked in: AP EAMCET 2021 (20 Aug Shift 2)

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