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2.8 Forces and Newton's laws

2.8 Forces and Newton's laws

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Question 8

In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2

A stone of mass 0.4 kg is released from rest at a point 2.5 metres vertically above the surface of a lake.

The stone falls freely under gravity until it enters the water.

While the stone is moving through the water it experiences a constant resistance of magnitude 12 N, in addition to its weight.

a.

Find the speed of the stone as it enters the water.

[2]
b.

Find the magnitude of the deceleration of the stone while it is moving through the water.

[3]
c.

Find the depth below the surface at which the stone first comes to instantaneous rest.

[2]
Markscheme

2.8 Forces and Newton's laws Questions

  1. A Level
  2. /Maths
  3. /2.8 Forces and Newton's laws

35 exam-style questions on WJEC A Level Maths 2.8 Forces and Newton's laws, covering 2.8.1 Forces and Newton's laws, 2.8.2 Forces and Newton's laws, 2.8.3 Forces and Newton's laws, 2.8.4 Forces and Newton's laws, 2.8.5 Forces and Newton's laws, and 2.8.6 Forces and Newton's laws. Each one has a worked solution and a mark scheme showing where the marks go.

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