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Work Power and Energy question

2020 · Shift 2 · Q44
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Work Power and Energy question

2020 · Shift 2 · Q44

JEE AdvancedPhysicsWork Power and EnergyMultiple correct+4 / −2
A student skates up a ramp that makes an angle 30 ∘^\circ∘ with the horizontal. He/she starts (as shown in the figure) at the bottom of the ramp with speed v0 and wants to turn around over a semicircular path xyz of radius R during which he/she reaches a maximum height h (at point y) from the ground as shown in the figure. Assume that the energy loss is negligible and the force required for this turn at the highest point is provided by his/her weight only. Then (g is the acceleration due to gravity) JEE Advanced 2020 Paper 2 Offline Physics - Work Power & Energy Question 9 English
  1. A
    v02−2gh=12gRv_0^2 - 2gh = {1 \over 2}gRv02​−2gh=21​gR
  2. B
    v02−2gh=32gRv_0^2 - 2gh = {{\sqrt 3 } \over 2}gRv02​−2gh=23​​gR
  3. C
    the centripetal force required at points x and z is zero
  4. D
    the centripetal force required is maximum at points x and z
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