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The image you uploaded shows a physics problem related to a rock being thrown upward on Mars. To help solve the problem, I would need the initial velocity of the rock, which isn't visible in the screenshot. I will outline the steps to solve each part based on the typical physics equations for projectile motion.

Assuming the acceleration due to gravity on Mars is \( g = 3.71 \, \text{m/s}^2 \) (which is approximately true), here’s how we can approach the questions:

### (a) Find the velocity after 2 seconds
The velocity of the rock at any time \( t \) can be found using the equation:
\[
v(t) = v_0 - g \cdot t
\]
where:
- \( v_0 \) is the initial velocity (unknown from the image, but necessary),
- \( g \) is the acceleration due to gravity on Mars (\( g = 3.71 \, \text{m/s}^2 \)),
- \( t = 2 \) seconds.

### (b) Find the velocity at time \( t = a \)
This is a general form of the same equation for velocity:
\[
v(a) = v_0 - g \cdot a
\]
where \( a \) is a variable time. You would need to plug in the value of \( a \) when given.

### (c) When will the rock hit the surface?
The rock will hit the surface when its displacement \( s = 0 \) (assuming it returns to the same height from

If a rock is thrown upward on the planet Mars with a velocity, find the following: (a) velocity after 2 seconds, (b) velocity at time t = a, (c) time when the rock will hit the surface, (d) velocity with which the rock hits the surface.

Learn how to solve a kinematics problem involving a rock thrown upward on Mars. This includes finding the velocity after 2 seconds, velocity at any given time, time to hit the surface, and impact velocity. Key formulas and physics concepts are covered, suitable for high school students.

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