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A car travels 20m /sec along …

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A car travels 20m /sec along a road a child runs out into the road 50m ahead the car driver stop the pedal what must the declaration be if the car is stop just before it reach the child

Posted by Srihaan Chandra 3 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 2 months ago

Initial velocity, u=20m/s
Final velocity, v=0m/s
Distance, s=50m

Using relation, v²= u²+ 2as
0²= (20)²+ 2 × a × 50
0²= 400 + 100a
−400 = 100a

a = −400 / 100 = −4m/s²
The car's deceleration must be 4m/s².

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