1. Sasquatch throws a rock horizontally off a cliff. After the rock is released,

Question

1. Sasquatch throws a rock horizontally off a cliff. After the rock is released, which statement about its acceleration is correct?

A. Its magnitude is constant.

B. Its magnitude is constantly increasing.

C. Its magnitude is constantly decreasing.

D. Its magnitude is zero.

2. A 3 kg object and a 9 kg object are both thrown directly upwards with the same initial speed v. If the 3 kg object reaches a maximum height h, what maximum height will the 9 kg object reach, assuming we can neglect air resistance for both?

A. h/3 B. h/2 C. h D. 3h

3. In a head-on crash between two cars, one car’s forward velocity can go from 26 m/s to 0.0 m/s in 0.14 s How many g’s (g = 9.8 m/s2 ) are experienced, on average, by the driver?

A. 21 g B. 14 g C. 19 g D. 26 g

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Explanation / Answer

1) A - It's magnitude is constant

For any object thrown in air (whether it is Horizantal or at an angle or vertical) acceleration is constant and is equal to g (9.8 m/sec2).

2) C - h

For an object thrown in air vertically with a velocity V, maximum height reached h = (V2/2g) which is independent of it's mass.

3) C - 19g

Acceleration a = (change in velocity) / time taken = (26-0)/0.14 = 185.7 m/sec2 = 19 x 9.8 m/sec2 = 19g.

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