First slide

The 3 equation for uniform acc

Question

For a body travelling with uniform acceleration, its final velocity is $\large v = \sqrt {180 - 7x}$ , where x is the distance travelled by the body. Then the acceleration is

Moderate

A

-8 m/s²
B

-3.5 m/s²
C

-7 m/s²
D

180 m/s²

Solution

v² = 180 - 7x ⇔ v²= u² + 2as
2a = -7 ⇒ a = -3.5m/s²

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