Saved Bookmarks
| 1. |
1. A car having mass 700 kg is moving at a speed of 90 km/hr. on applying brakes speed is reduced to 36 km/hr, in 10s. Calculate the force applied by the brakes.Pls answer fast...Its urgent. Love ya |
|
Answer» m= 700 kgu= 90 km/hr = 90 * 5/ 18 m/s = 25 m/s v = 36 km/hr = 30 * 5/18 m/s = 10 m/st = 10s a = ?F = ?a= (v-u) /TA = (10 - 25) / 10a = -15/10 = -1.5 m/s ²negative SIGN means car is retarding we know that Force = mass * accelerationso, 700 * ( - 1.5) F = -1050 N THEREFORE ∴ the force applied by the brakes is 1050 N in the opposite direction .hope it HELPS =)pls thumbs up |
|