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**How much time would be requird to stop a 2,000 kg car that is moving at 80.0 km/hr if the braking force is 8,000 N?**

I know.....

Mass 2000 kg

Acceleration is 80.0 km/hr

Breaking force is 8,000 N

What tension must a 50.0 cm length of string support in order to whirl an attached 1,000.0 gram stone in a circular path at 5.00 m/s?

What tension must a 50.0 cm length of string support in order to whirl an attached 1,000.0 gram stone in a circular path at 5.00 m/s?

I used the formula F= mv^2/ r

= (1,000.0 g) (5.00 m/s)/ 50.0 cm

= 1,000.0 x 5.00 g*m/s

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50.0

I wanted to know if I was tackling this question correctly..if not what am I doing wrong????

THX!