Question

a steel sphere of mass 100 gm moving with a velocity of 4m/s collides with a dust particle elastically moving in the same direction

Answer 1

We know that I=FΔt=mΔvI=FΔt=mΔv

we have,

m=0.1 kg

Δv=|vfinal−vinitial|=|(−10)−(10)Δv=|vfinal−vinitial|=|(−10)−(10)|ms−1=20ms−1ms−1=20ms−1

so Impulse I=0.1×20kgms−1I=0.1×20kgms−1

⟹2kgms−1⟹2kgms−1

433