1 a ) A 1500 kg car is driving 30 m/s on the highway. The car reaches an off-ramp and slows to 15 m/s. How much impulse is applied to the car? 1 b ) How much force is required for the car in the previous question to complete its deceleration a) in 10 seconds, and b) in 5 seconds?

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s