A ball of mass 2kg moves with speed 10m/s and it strikes normally with a wall and reflected back
normally with speed of 5m/s , if it’s time of contact with wall is 0.2 sec then find magnitude of change in
momentum and force exerted by ball on the wall.
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m=2kg,u=(10i)m/s,v=(-5i)m/s,t=0.2s
acceleration=v-u/t
-5i-10i/0.2=-15i/0.2=-75m/s²
a=-75m/s²
momentum=mv-mu=-10i-20i=-30i
magnitude=√(-30)²=-20Ns
F=MA=0.2×-75=-15N
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