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Question 4

An underwater research rover (ROV) is being winched upwards towards a recovery ship. As it nears the surface, it decelerates.

  • The ROV decelerates at 0.4 m/s2.
  • The combined mass of the ROV and its payload is 350 kg.
a.

Calculate the time taken for the vertical velocity of the ROV to decrease from 3.5 m/s to 1.1 m/s. Use the equation:

$$

\text{time taken} = \frac{\text{change in velocity}}{\text{deceleration}}

$$
[2]
b.

Calculate the magnitude of the resultant vertical force acting on the ROV to cause this deceleration. Use the equation:

$$

\text{resultant force} = \text{mass} \times \text{deceleration}

$$
[2]
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5 Forces Questions

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