Question

solve this question plzz

Answer 1

Ans:-- (1)7m/s

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Answer 2

We will apply kinematics equation in this question.

The appropriate kinematics equation to apply in this question is as follows:

v² = u² + 2gs

Where:

v = the final velocity

u = the initial velocity

g = acceleration due to gravity

s = the displacement

We need to get the final velocity at Q.

v² = 5² + 2 × 10 × 4 = 105

v = √105

We need the final velocity at R.

Now :

u = √105

s = 1.65 m

In this case since the motion is upwards the kinematics equation becomes:

v² = (√105)² - 2 × 10 × 1.65

v² = 105 - 33

v² = 72

v = √72

v = √36 × 2

= 6√2 m/s