Question

Two bullets P and Q, masses 10 gram and 20 gram are moving in the same direction towards the targets with velocities 20m/s and 10m/s respectively. Which one the bullets will pierce a greater distance into the target? ​

Answer 1

Explanation:

as mass is inversely proportional to acceleration,bullet P of 10 gram will have more acceleration and thus pierce a greater distance in the target

Answer 2

Answer:

mass of P = 10 g = 10 / 1000 = 0.01 kg

velocity of P = 20 m/s

initial of P = 0 m / s

mass of Q = 20 g = 20 / 1000 = 0.02 kg

velocity of Q = 10 m/s

initial of Q = 0 m / s 

acceleration of P and Q = 10 m / s

distance of P ,

2as = v² - u²

2 * 10 * s = 20²- 0²

20 * s = 400

s = 400 / 20 

s = 20 m

distance of Q ,

2as = v² - u²

2 * 10 * s = 10² - 0²

20 * s = 100

s = 100 / 20

s = 5 m

therefore the answer is P .

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