In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 99.0 km/h , to his enemy's car, which is going 115 km/h . The enemy's car is 17.0 m in front of the Indy's when he lets go of the grenade.AIf Indy throws the grenade so its initial velocity relative to him is at an angle of 45 ∘ above the horizontal, what should the magnitude of the initial velocity be? The cars are both traveling in the same direction on a level road. You can ignore air resistance.BFind the magnitude of the velocity relative to the earth.

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Asked Nov 22, 2019
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In the latest Indian Jones film, Indy is supposed to throw a grenade from his car, which is going 99.0 km/h , to his enemy's car, which is going 115 km/h . The enemy's car is 17.0 m in front of the Indy's when he lets go of the grenade.

A

If Indy throws the grenade so its initial velocity relative to him is at an angle of 45 ∘ above the horizontal, what should the magnitude of the initial velocity be? The cars are both traveling in the same direction on a level road. You can ignore air resistance.

B

Find the magnitude of the velocity relative to the earth.

 

 

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Expert Answer

Step 1

A   

The relative velocity of the enemy’s car with respect to the Indian’s car is

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- V. eпетy rel grenade 115-99 16km/h 4.432m/s

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Step 2

After time t, the grenade hits the enemy. Then the time it takes for the grenade to rise and fall back to the level of the car can be calculated as follows,

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vcos 45-vsin 45 + gt gt [2] g

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Step 3

Then the distance travelled by the grena...

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(vcos45) 17.0m +v rel

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