Problem 1: A ball is thrown horizontally from the top of a 30-m high hill. It strikes the ground at an angle of 45°
below the horizontal. With what velocity does the ball land with? Formula: ViViragt

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Dowielol56viz Dowielol56viz · Answer 1

Answer:

SANA MAKATULONG

Explanation:

This is an SAT Subject Test – Physics question.

Strikes ground at 45°: Horizontal and vertical components equal at this moment.

Thrown horizontally: Vertical component of velocity present only due to acceleration due to gravity.

20-m high hill: (v_vertical)^2 - 0^2 = 2 * 10 * 20 (v^2 - u^2 = 2 a s) so v_vertical = 20 m/s.

(Gravity acts only in vertical direction): v_horizontal is always the same, and is equal to v_vertical (from point 1).

Answer: v_horizontal = 20 m/s.