A2200 kg truck is coming down a hill 50 m high towards a stop sign. what force will the brakes need to provide (in n) in order to stop the truck in the 300 m before the sign? (this is a conservation of energy problem). use g = 10 m/s^2.

The force required by the brakes is

Solution:

As per the question:

Mass of the truck, M = 2200 kg

Height, h = 50 m

distance moved by the truck before stopping, x = 300 m

Force required by the brakes to stop the truck, can be calculated by using the law of conservation of energy.

Now,

Kinetic Energy(K.E) downhil, K.E = reduction in potential energy,

Work done is provided by the decrease in K.E,i.e.,  change in potential energy.

W =

F =

graphing motion: mastery test

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