Question

please answer with full explanation with proper formula

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Answer 1

Answer:

given , initial velocity at P is 5m/s

So, we use Newton second equation of motion

v^2 = u^2 + 2as

=> v^2 = 5^2 + 2 × -10 × -4

=> v^2 = 105

=> v = √105 m/s

Not, considered motion from Q to R

initial velocity become √105m/s

So, again use Newton third equation of motion

v^2 = u^2 + 2as

=> v^2 = √105^2 + 2 × -10 × 1.65

=> v^2 = 105 - 33

=> v^2 = 72

=> v = 6√2 m/s

•°•, it's velocity at R is 6√2 m/s

Hence, option (3) is correct .

Answer 2

Answer:

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Explanation: