projectile

[adrakdavra]

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If a projectile is shot near the surface of the Earth with a speed of 2.0 km/s horizontally, how far will it fall in 0.010 s?
A) 4.9E-4 m
B) 4.9E-2 m
C) 9.8E-2 m
D) 2.0E1 m
E) None of the above

A is the answer, but why? i thought the answer will be 20m using d=V .t

 

[Temperature101]

If a projectile is shot near the surface of the Earth with a speed of 2.0 km/s horizontally, how far will it fall in 0.010 s?
A) 4.9E-4 m
B) 4.9E-2 m
C) 9.8E-2 m
D) 2.0E1 m
E) None of the above

A is the answer, but why? i thought the answer will be 20m using d=V .t

Falling (y-direction).....Y = 1/2 gt^2. They give you that horizontal speed to trick you... These are the STUPID stuff AAMC might do on the real test.

 

[adrakdavra]

Falling (y-direction).....Y = 1/2 gt^2. They give you that horizontal speed to trick you... These are the STUPID stuff AAMC might do on the real test.

thanks, So to find range or distance in projectile problems we use Y=1/2 gt^2 regardless what the velocity is or the angle ???

 

[Temperature101]

thanks, So to find range or distance in projectile problems we use Y=1/2 gt^2 regardless what the velocity is or the angle ???

This is NOT the range. They are asking you how far below the height it was thrown the projectile will be after some seconds. This is somewhat a free fall problem. They just give the projectile an horizontal velocity to confuse people...If they ask for range, you use d = vt. Range is in the x-direction.