A ball of mass 2 kg travelling at 8 ms-1 strikes a ball of mass 4kg travelling at 2ms-1. Both balls are moving along the same straight line as shown. After collision, both balls move at the same velocity v. What is the magnitude of the velocity V?
Correct answer: A. 4 ms-1
- A. 4 ms-1
- B. 6 ms-1
- C. 5 ms-1
- D. 8 ms-1
Explanation
For inelastic collision, momentum is still conversed. Momentum before collision = momentum after collision. m1u1+m2u2=(m1+m2)V (2)(8)+(4)(2)=(2+4)V V=4ms-1
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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