# Please help thank you will upvote ! The position a block with mass m=6kg is given...

###### Question:

The position a block with mass m=6kg is given by F =(1.2m/s) 4+15.9 m/s)t3-(3.3 m/s^)t* 2. what is magnitude of the force at t=5 sec? (disregard the gravitational force)
A car moving at speed 32 m/s on a dry pavement, skids to a stop over 227 m. What is the coefficient of friction between the cars tires and the pavement assume g=10m/s^2, and write down your answer up to two decimal points)
A projectile with the mass m=6.3 g is shot upward with the velocity v =20m/s. This projectile return to the initial position with velocity Vi= 16 m/s. How many joules of work is done by weight of the projectile?

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