Physics
If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with

Constant acceleration
Constant velocity
Constant speed
Varying acceleration

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Physics
Plants are dried up in winter due to frost because

Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails
Photosynthesis does not take place at such low temperature
Evaporation does not take place

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