Help! Please?
A projectile is thrown from the top of a building with initial horizontal velocity 4ms . The building is 45m high. What is the velocity of the projectile after 2 seconds.
I make it 20ms , but the options are:
4ms
8ms
40ms
80ms
I keep recalculating according to how you are supposed to solve these, but still get the same answer. I don't no what else to do.
Thanks.
A projectile is thrown from the top of a building with initial horizontal velocity
I make it
I keep recalculating according to how you are supposed to solve these, but still get the same answer. I don't no what else to do.
Thanks.
1 Answer
Please see the explanation below.
Explanation:
Here is what I think about this problem :
The horizontal velocity will remain constant.
Let the acceleration due to gravity
The vertical component of the velocity is
After
The velocity is
I get the same answer as you. There is a mistake either in the question or in the options.
Good Luck!