Physics
The force which makes a vehicle to stop when break is applied is called

Covalant force
Vanderwalls force
Gravitational force
Frictional force

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Physics
Plants are dried up in winter due to frost because

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

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