1.

two cars weighing 1500 kg are made to collide with wall.the initial and final velocities of the car are - 15.0 m/s & 2.6m/s respectively. If the collision lasts for 0.15 s, then find impulsive force exerted on the car.

Answer»

FORCE = mass × Acceleration


Acceleration = CHANGE in speed ÷ change in time


Change in speed is : 2.6 - 15 = - 12.4m/s


t = 0.15


a = 12.4/0.15 = - 82.67m/s²


The negative sign indicates that car DECELERATES.


F = 1500 × 82.67 = 24005 N



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