19. a) State Newton's second law of motion. A car accelerates uniforml

1.	19. a) State Newton's second law of motion. A car accelerates uniformlyfrom 18 km/h to 36 km/h in 5 sec. calculate the acceleration.y do the passengers in a bus tend to fall forward when it suddenstops?b) Wh
Answer» a)Newton's Second law:-The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. ∴Acceleration=(v-u)/t=(36-18)km/h/5 secs=(10-5)/5=1 ms⁻² b)So when thebusor train stopped suddenly, apassengersitting inside tends tofall forward. Because the lower part of the body comes to rest with thebuswhile the upper part tends to continue its motion due to inertia.

19. a) State Newton's second law of motion. A car accelerates uniformlyfrom 18 km/h to 36 km/h in 5 sec. calculate the acceleration.y do the passengers in a bus tend to fall forward when it suddenstops?b) Wh

Answer»

a)Newton's Second law:-The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

∴Acceleration=(v-u)/t=(36-18)km/h/5 secs=(10-5)/5=1 ms⁻²

b)So when thebusor train stopped suddenly, apassengersitting inside tends tofall forward. Because the lower part of the body comes to rest with thebuswhile the upper part tends to continue its motion due to inertia.

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