Question

In two different experiments, an object of mass 5 kg moving with a speed of 25 ms^-1 hits two different walls and comes to rest within (i) 3 second, (ii) 5 seconds, respectively. Choose the correct option out of the following :

Options

• Impulse and average force acting on the object will be same for both the cases. 

• Impulse will be same for both the cases but the average force will be different. 

• Average force will be same for both the cases but the impulse will be different. 

• Average force and impulse will be different for both the cases.

Answer 1

Impulse will be same for both the cases but the average force will be different. 

Explanation:

Impulse, I = change in momentum, ΔP

`"F"_"avg"=(Delta"P")/(Delta"t")`  ∵ ΔP₁ = ΔP₂  ∴ I₂ = I₂

Given Δt₁ = 3s and Δt₂ = 5s

Hence, `"F"_"avg"` in case (i), when Δt₂ = 3s is more than (ii) when Δt₂ = 5s