Question

11. Assertion : At highest point of a projectile, dot product ofvelocity and acceleration is zero.y Reason: At highest point, velocity and acceleration aremutually perpendicular.12. Assertion : The escape speed for the moon is 2.3 kmswhich is five times smaller than that of the earth.Reason: The escape speed depends on acceleration duea. to gravity on the moon and radius of the moon and bothof them are smaller than that of earth.13. Young's modulus for a perfectly plastic body is zero.b Reason: For a perfectly plastic body, restoring force iszero.​

Answer 1

Answer:

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