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Which situation conserves mechanical energy?

What is the reaction force to a person pushing a wall?

The slope of a velocity-time graph represents:A) DisplacementB) AccelerationC) ForceD) Work

Which quantity always opposes motion?

What happens to kinetic energy if speed doubles?A) Stays sameB) DoublesC) QuadruplesD) Halves

A block is pulled with constant force over distance dd. How do you calculate work using calculus?A) ∫F dt\int F\, dtB) ∫F dx\int F\, dxC) ∫F dv\int F\, dvD) ∫F da\int F\, da

In uniform circular motion, acceleration points:A) Tangent to the circleB) OutwardC) InwardD) Along velocity

If constant power is applied, what happens to work over time?A) Stays constantB) Increases linearlyC) Decreases linearlyD) Increases quadratically

If v(t)=3t2v(t) = 3t^2v, what is the acceleration at t=2 st = 2\, s?A) 6 m/sB) 12 m/s²C) 3 m/s²D) 4 m/s²

Which unit represents work?A) N·sB) N·mC) kg·m/sD) m/s²